"tau" meaning in English

See tau in All languages combined, or Wiktionary

Noun

IPA: /taʊ/ [Received-Pronunciation], /tɔː/ [Received-Pronunciation], /taʊ/ [General-American], /tɔ/ [General-American] Audio: En-us-tau.ogg [General-American] Forms: taus [plural]
Rhymes: -aʊ, -ɔː Etymology: From Middle English tau, taue, from Latin tau, from Ancient Greek ταῦ (taû) and Hebrew תָּו (tav) Sense 6 (“mathematical constant equal to 2π”) was used by Joseph M. Lindenberg in 1991, and popularized by the American educator and entrepreneur Michael Hartl in a 2010 paper which explains that τ resembles π; and that τ is the Greek equivalent of t, the first letter of turn, and 2π corresponds to one turn of a circle with a radius of one unit. Sense 8.1 (“short for tau lepton or tau particle”) was coined by the American physicist Martin Lewis Perl (1927–2014) after the first letter of Ancient Greek τρίτον (tríton, “third”), since the tau lepton or tauon was the third charged lepton discovered. Etymology templates: {{!}} |, {{!}} |, {{!}} |, {{!}} |, {{!}} |, {{!}} |, {{sequence box|current=|footer=Wikipedia article on tau|next=→ upsilon|previous=← sigma|text=<big>Τ τ </big> Ancient Greek: ταῦ|title=Ancient Greek Alphabet}}, {{letter_disp2|sigma||upsilon|ταῦ|Τ|τ}}, {{lang|grc|π}} π, {{lang|grc|τ}} τ, {{inh|en|enm|tau}} Middle English tau, {{m|enm|taue}} taue, {{der|en|la|tau}} Latin tau, {{der|en|grc|ταῦ}} Ancient Greek ταῦ (taû), {{der|en|he|תָּו|tr=tav}} Hebrew תָּו (tav), {{lang|grc|π}} π, {{lang|grc|τ}} τ, {{lang|grc|π}} π, {{lang|grc|τ}} τ, {{m|en|t}} t, {{m|en|turn}} turn, {{lang|grc|π}} π, {{lang|grc|τ}} τ, {{lang|grc|τ}} τ, {{lang|grc|τ}} τ, {{lang|grc|τ}} τ, {{coinage|en|Martin Lewis Perl|nat=the American|nobycat=1|nocap=1|occ=physicist}} coined by the American physicist Martin Lewis Perl, {{noncog|grc|τρίτον|t=third}} Ancient Greek τρίτον (tríton, “third”), {{lang|grc|τριτον}} τριτον Head templates: {{en-noun}} tau (plural taus)
  1. The letter Τ/τ in the Greek alphabet; being the nineteenth letter of the Classical and Modern Greek, and the twenty-first letter of the Old and Ancient Greek alphabets. Categories (topical): Greek letter names Translations (the letter Τ/τ in the Greek alphabet): ταῦ (taû) [neuter] (Ancient Greek), تَاو (tāw) [masculine] (Arabic), tau [feminine] (Catalan), (táo) (Chinese Mandarin), (tào) (Chinese Mandarin), tau [neuter] (Czech), tau [neuter] (Danish), tau [feminine, masculine] (Dutch), taŭo (Esperanto), tau (Finnish), tau [masculine] (French), ტაუ (ṭau) (Georgian), Tau [neuter] (German), ταυ (taf) [neuter] (Greek), טָאוּ (tau) [feminine] (Hebrew), tau (Hungarian), [neuter] (Icelandic), tau (Interlingua), tau [feminine, masculine] (Italian), タウ (tau) (Japanese), 타우 (tau) (Korean), tau (Malay), tau [neuter] (Norwegian Bokmål), tau [neuter] (Norwegian Nynorsk), tau [neuter] (Polish), tau [masculine] (Portuguese), тау (tau) [neuter] (Russian), tau [feminine] (Spanish), tau [neuter] (Swedish), เทา (tao) (Thai), тау (tau) [neuter] (Ukrainian), tau [feminine] (Welsh)
    Sense id: en-tau-en-noun-bd~mcLvF Disambiguation of Greek letter names: 32 9 9 9 3 3 8 3 9 8 7 Categories (other): English entries with incorrect language header, English entries with language name categories using raw markup, English entries with topic categories using raw markup, English terms with non-redundant non-automated sortkeys Disambiguation of English entries with incorrect language header: 21 4 12 12 5 3 2 2 13 13 12 Disambiguation of English entries with language name categories using raw markup: 17 3 17 17 4 4 2 2 17 11 8 Disambiguation of English entries with topic categories using raw markup: 27 3 11 11 6 3 2 2 11 17 7 Disambiguation of English terms with non-redundant non-automated sortkeys: 21 3 14 14 5 4 2 3 13 13 9 Disambiguation of 'the letter Τ/τ in the Greek alphabet': 71 4 2 2 1 3 3 3 3 4 4
  2. Alternative form of taw; the 22nd and last letter of many Semitic alphabets/abjads, including Phoenician, Aramaic, Hebrew, Syriac, and Arabic. Tags: alt-of, alternative Alternative form of: taw (extra: the 22nd and last letter of many Semitic alphabets/abjads, including Phoenician, Aramaic, Hebrew, Syriac, and Arabic)
    Sense id: en-tau-en-noun-F9WwTQVk
  3. A Τ-shaped object or sign; a Saint Anthony's cross, sometimes regarded as a sacred symbol.
    Sense id: en-tau-en-noun-J4csToYB Categories (other): English entries with language name categories using raw markup Disambiguation of English entries with language name categories using raw markup: 17 3 17 17 4 4 2 2 17 11 8
  4. A Τ-shaped object or sign; a Saint Anthony's cross, sometimes regarded as a sacred symbol.
    (Christianity) A crosier with a Τ-shaped head.
    Categories (topical): Christianity
    Sense id: en-tau-en-noun-MAFTpTak Categories (other): English entries with language name categories using raw markup Disambiguation of English entries with language name categories using raw markup: 17 3 17 17 4 4 2 2 17 11 8 Topics: Christianity
  5. The ankh symbol (☥). Synonyms: crux ansata
    Sense id: en-tau-en-noun-HBuXMgw-
  6. (astronomy) Chiefly written τ: used to designate the nineteenth star (usually according to brightness) in a constellation. Categories (topical): Astronomy
    Sense id: en-tau-en-noun-JBrG7GC- Topics: astronomy, natural-sciences
  7. (finance) A measurement of the sensitivity of the value of an option to changes in the implied volatility of the price of the underlying asset. Categories (topical): Finance Synonyms: kappa, vega
    Sense id: en-tau-en-noun-TLBpUwl2 Topics: business, finance
  8. (mathematics, neologism) Chiefly written τ: an irrational and transcendental constant representing the ratio of the circumference of a Euclidean circle to its radius, equal to twice the value of pi (2π; approximately 6.2831853071). Tags: neologism Categories (topical): Mathematics
    Sense id: en-tau-en-noun-Y9xgHUAj Categories (other): English neologisms Topics: mathematics, sciences
  9. (neurology) Short for tau protein (“a protein abundant especially in the neurons of the human central nervous system that stabilizes microtubules, and when misfolded is associated with forms of dementia such as Alzheimer's and Parkinson's diseases”). Tags: abbreviation, alt-of Alternative form of: tau protein (extra: a protein abundant especially in the neurons of the human central nervous system that stabilizes microtubules, and when misfolded is associated with forms of dementia such as Alzheimer's and Parkinson's diseases) Categories (topical): Neurology Translations (short for tau protein — see also tau protein): tau [feminine] (French)
    Sense id: en-tau-en-noun-ZFfnF8AT Categories (other): English entries with language name categories using raw markup Disambiguation of English entries with language name categories using raw markup: 17 3 17 17 4 4 2 2 17 11 8 Topics: medicine, neurology, neuroscience, sciences Disambiguation of 'short for tau protein — see also tau protein': 9 2 6 6 3 1 1 1 37 16 18
  10. (physics) Chiefly written τ.
    Short for tau lepton or tau particle (“an unstable elementary particle which is a type of lepton, having a mass almost twice that of a proton, a negative charge, and a spin of ½; it decays into hadrons (usually pions) or other leptons, and neutrinos; a tauon”).
    Tags: abbreviation, alt-of Alternative form of: tau lepton or tau particle (extra: (“an unstable elementary particle which is a type of lepton, having a mass almost twice that of a proton, a negative charge, and a spin of ½; it decays into hadrons (usually pions) or other leptons, and neutrinos; a tauon”)) Categories (topical): Subatomic particles, Leptons
    Sense id: en-tau-en-noun-ON2Df9AC Disambiguation of Leptons: 19 3 9 9 4 3 2 2 12 29 9 Categories (other): English entries with language name categories using raw markup Disambiguation of English entries with language name categories using raw markup: 17 3 17 17 4 4 2 2 17 11 8 Topics: natural-sciences, physical-sciences, physics
  11. (physics) Chiefly written τ.
    (historical) Short for tau meson, now known as a kaon.
    Tags: abbreviation, alt-of, historical Alternative form of: tau meson, now known as a kaon Categories (topical): Subatomic particles
    Sense id: en-tau-en-noun-8bZwf2rc Topics: natural-sciences, physical-sciences, physics
The following are not (yet) sense-disambiguated
Translations (Saint Anthony’s cross — see also Saint Anthony's cross): croix en tau [feminine] (French), Taukreuz [neuter] (German)
Derived forms: tau bone, tau cross, tau effect, tau lepton, tau meson, tau neutrino, tauon, tauopathy, tau particle, tau protein, tau staff, tau tangle Disambiguation of "Saint Anthony’s cross — see also Saint Anthony's cross": 9 2 36 36 2 1 0 0 6 5 3

Inflected forms

Download JSON data for tau meaning in English (24.4kB)

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          "code": "ar",
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          "roman": "tāw",
          "sense": "the letter Τ/τ in the Greek alphabet",
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          "tags": [
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          "roman": "táo",
          "sense": "the letter Τ/τ in the Greek alphabet",
          "word": "陶"
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          "_dis1": "71 4 2 2 1 3 3 3 3 4 4",
          "code": "zh",
          "lang": "Chinese Mandarin",
          "roman": "tào",
          "sense": "the letter Τ/τ in the Greek alphabet",
          "word": "套"
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          "lang": "Czech",
          "sense": "the letter Τ/τ in the Greek alphabet",
          "tags": [
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          "lang": "Danish",
          "sense": "the letter Τ/τ in the Greek alphabet",
          "tags": [
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          "word": "tau"
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        {
          "_dis1": "71 4 2 2 1 3 3 3 3 4 4",
          "code": "nl",
          "lang": "Dutch",
          "sense": "the letter Τ/τ in the Greek alphabet",
          "tags": [
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            "masculine"
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          "word": "tau"
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        {
          "_dis1": "71 4 2 2 1 3 3 3 3 4 4",
          "code": "eo",
          "lang": "Esperanto",
          "sense": "the letter Τ/τ in the Greek alphabet",
          "word": "taŭo"
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          "code": "fi",
          "lang": "Finnish",
          "sense": "the letter Τ/τ in the Greek alphabet",
          "word": "tau"
        },
        {
          "_dis1": "71 4 2 2 1 3 3 3 3 4 4",
          "code": "fr",
          "lang": "French",
          "sense": "the letter Τ/τ in the Greek alphabet",
          "tags": [
            "masculine"
          ],
          "word": "tau"
        },
        {
          "_dis1": "71 4 2 2 1 3 3 3 3 4 4",
          "code": "ka",
          "lang": "Georgian",
          "roman": "ṭau",
          "sense": "the letter Τ/τ in the Greek alphabet",
          "word": "ტაუ"
        },
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          "_dis1": "71 4 2 2 1 3 3 3 3 4 4",
          "code": "de",
          "lang": "German",
          "sense": "the letter Τ/τ in the Greek alphabet",
          "tags": [
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          "word": "Tau"
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        {
          "_dis1": "71 4 2 2 1 3 3 3 3 4 4",
          "code": "el",
          "lang": "Greek",
          "roman": "taf",
          "sense": "the letter Τ/τ in the Greek alphabet",
          "tags": [
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          ],
          "word": "ταυ"
        },
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          "code": "grc",
          "lang": "Ancient Greek",
          "roman": "taû",
          "sense": "the letter Τ/τ in the Greek alphabet",
          "tags": [
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          "word": "ταῦ"
        },
        {
          "_dis1": "71 4 2 2 1 3 3 3 3 4 4",
          "code": "he",
          "lang": "Hebrew",
          "roman": "tau",
          "sense": "the letter Τ/τ in the Greek alphabet",
          "tags": [
            "feminine"
          ],
          "word": "טָאוּ"
        },
        {
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          "code": "hu",
          "lang": "Hungarian",
          "sense": "the letter Τ/τ in the Greek alphabet",
          "word": "tau"
        },
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          "code": "is",
          "lang": "Icelandic",
          "sense": "the letter Τ/τ in the Greek alphabet",
          "tags": [
            "neuter"
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          "word": "tá"
        },
        {
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          "code": "ia",
          "lang": "Interlingua",
          "sense": "the letter Τ/τ in the Greek alphabet",
          "word": "tau"
        },
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          "code": "it",
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          "sense": "the letter Τ/τ in the Greek alphabet",
          "tags": [
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            "masculine"
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          "word": "tau"
        },
        {
          "_dis1": "71 4 2 2 1 3 3 3 3 4 4",
          "code": "ja",
          "lang": "Japanese",
          "roman": "tau",
          "sense": "the letter Τ/τ in the Greek alphabet",
          "word": "タウ"
        },
        {
          "_dis1": "71 4 2 2 1 3 3 3 3 4 4",
          "code": "ko",
          "lang": "Korean",
          "roman": "tau",
          "sense": "the letter Τ/τ in the Greek alphabet",
          "word": "타우"
        },
        {
          "_dis1": "71 4 2 2 1 3 3 3 3 4 4",
          "code": "ms",
          "lang": "Malay",
          "sense": "the letter Τ/τ in the Greek alphabet",
          "word": "tau"
        },
        {
          "_dis1": "71 4 2 2 1 3 3 3 3 4 4",
          "code": "nb",
          "lang": "Norwegian Bokmål",
          "sense": "the letter Τ/τ in the Greek alphabet",
          "tags": [
            "neuter"
          ],
          "word": "tau"
        },
        {
          "_dis1": "71 4 2 2 1 3 3 3 3 4 4",
          "code": "nn",
          "lang": "Norwegian Nynorsk",
          "sense": "the letter Τ/τ in the Greek alphabet",
          "tags": [
            "neuter"
          ],
          "word": "tau"
        },
        {
          "_dis1": "71 4 2 2 1 3 3 3 3 4 4",
          "code": "pl",
          "lang": "Polish",
          "sense": "the letter Τ/τ in the Greek alphabet",
          "tags": [
            "neuter"
          ],
          "word": "tau"
        },
        {
          "_dis1": "71 4 2 2 1 3 3 3 3 4 4",
          "code": "pt",
          "lang": "Portuguese",
          "sense": "the letter Τ/τ in the Greek alphabet",
          "tags": [
            "masculine"
          ],
          "word": "tau"
        },
        {
          "_dis1": "71 4 2 2 1 3 3 3 3 4 4",
          "code": "ru",
          "lang": "Russian",
          "roman": "tau",
          "sense": "the letter Τ/τ in the Greek alphabet",
          "tags": [
            "neuter"
          ],
          "word": "тау"
        },
        {
          "_dis1": "71 4 2 2 1 3 3 3 3 4 4",
          "code": "es",
          "lang": "Spanish",
          "sense": "the letter Τ/τ in the Greek alphabet",
          "tags": [
            "feminine"
          ],
          "word": "tau"
        },
        {
          "_dis1": "71 4 2 2 1 3 3 3 3 4 4",
          "code": "sv",
          "lang": "Swedish",
          "sense": "the letter Τ/τ in the Greek alphabet",
          "tags": [
            "neuter"
          ],
          "word": "tau"
        },
        {
          "_dis1": "71 4 2 2 1 3 3 3 3 4 4",
          "code": "th",
          "lang": "Thai",
          "roman": "tao",
          "sense": "the letter Τ/τ in the Greek alphabet",
          "word": "เทา"
        },
        {
          "_dis1": "71 4 2 2 1 3 3 3 3 4 4",
          "code": "uk",
          "lang": "Ukrainian",
          "roman": "tau",
          "sense": "the letter Τ/τ in the Greek alphabet",
          "tags": [
            "neuter"
          ],
          "word": "тау"
        },
        {
          "_dis1": "71 4 2 2 1 3 3 3 3 4 4",
          "code": "cy",
          "lang": "Welsh",
          "sense": "the letter Τ/τ in the Greek alphabet",
          "tags": [
            "feminine"
          ],
          "word": "tau"
        }
      ]
    },
    {
      "alt_of": [
        {
          "extra": "the 22nd and last letter of many Semitic alphabets/abjads, including Phoenician, Aramaic, Hebrew, Syriac, and Arabic",
          "word": "taw"
        }
      ],
      "categories": [],
      "examples": [
        {
          "ref": "1847, Richard Edmund Tyrwhitt, Sermons Chiefly Expository, volume I, Oxford: John Henry Parker; F[rancis] and J[ohn] Rivington, London, page 366",
          "text": "Hence it appears that the spits, or skewers, on which and to which the lamb was fixed and fastened in order to be roasted, assumed the form of a cross, not such a tau-cross as is engraved in Dr. Oliver’s Historical Landmarks of Freemasonry, vol. i. p. 80. having three arms only like the Greek letter tau; but a cross like the ancient Hebrew tau, with four arms, though not necessarily all of equal length.",
          "type": "quotation"
        },
        {
          "ref": "1851, D[aniel] Rock, Hierurgia; or Transubstantiation, Invocation of Saints, Relics, and Purgatory, Besides Those Other Articles of Doctrine Set Forth in the Holy Sacrifice of the Mass, Expounded; […], 2nd edition, London: C. Dolman, […], page 350",
          "text": "In the Spanish translation of Sallust, by the Infant Don Gabriel in 1772, called the Infant Sallust, there is a curious dissertation by Father Perez Bayer on the resemblance between the ancient Hebrew and Phœnician alphabets, in which it is observed that the Hebrew Tau was written in pure Phœnician, […]",
          "type": "quotation"
        },
        {
          "ref": "2017, Piers Vaughan, Capitular Development Course, 2nd edition, Rose Circle Publications, page 135",
          "text": "The tau is both the 19ᵗʰ letter of the Greek alphabet, and also the 22ⁿᵈ letter of the Hebrew alphabet. In this context, the Hebrew tau or tav is more pertinent.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative form of taw; the 22nd and last letter of many Semitic alphabets/abjads, including Phoenician, Aramaic, Hebrew, Syriac, and Arabic."
      ],
      "id": "en-tau-en-noun-F9WwTQVk",
      "links": [
        [
          "taw",
          "taw#English"
        ],
        [
          "Semitic",
          "Semitic"
        ],
        [
          "alphabet",
          "alphabet"
        ],
        [
          "abjad",
          "abjad"
        ],
        [
          "Phoenician",
          "Phoenician"
        ],
        [
          "Aramaic",
          "Aramaic"
        ],
        [
          "Hebrew",
          "Hebrew"
        ],
        [
          "Syriac",
          "Syriac"
        ],
        [
          "Arabic",
          "Arabic"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    },
    {
      "categories": [
        {
          "_dis": "17 3 17 17 4 4 2 2 17 11 8",
          "kind": "other",
          "name": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "A Τ-shaped object or sign; a Saint Anthony's cross, sometimes regarded as a sacred symbol."
      ],
      "id": "en-tau-en-noun-J4csToYB",
      "links": [
        [
          "shaped",
          "shaped#Adjective"
        ],
        [
          "object",
          "object#Noun"
        ],
        [
          "sign",
          "sign#Noun"
        ],
        [
          "Saint Anthony's cross",
          "Saint Anthony's cross"
        ],
        [
          "regarded",
          "regard#Verb"
        ],
        [
          "sacred",
          "sacred#Adjective"
        ],
        [
          "symbol",
          "symbol#Noun"
        ]
      ]
    },
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Christianity",
          "orig": "en:Christianity",
          "parents": [
            "Abrahamism",
            "Religion",
            "Culture",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "_dis": "17 3 17 17 4 4 2 2 17 11 8",
          "kind": "other",
          "name": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "A Τ-shaped object or sign; a Saint Anthony's cross, sometimes regarded as a sacred symbol.",
        "A crosier with a Τ-shaped head."
      ],
      "id": "en-tau-en-noun-MAFTpTak",
      "links": [
        [
          "shaped",
          "shaped#Adjective"
        ],
        [
          "object",
          "object#Noun"
        ],
        [
          "sign",
          "sign#Noun"
        ],
        [
          "Saint Anthony's cross",
          "Saint Anthony's cross"
        ],
        [
          "regarded",
          "regard#Verb"
        ],
        [
          "sacred",
          "sacred#Adjective"
        ],
        [
          "symbol",
          "symbol#Noun"
        ],
        [
          "Christianity",
          "Christianity"
        ],
        [
          "crosier",
          "crosier"
        ],
        [
          "head",
          "head#Noun"
        ]
      ],
      "raw_glosses": [
        "A Τ-shaped object or sign; a Saint Anthony's cross, sometimes regarded as a sacred symbol.",
        "(Christianity) A crosier with a Τ-shaped head."
      ],
      "topics": [
        "Christianity"
      ]
    },
    {
      "glosses": [
        "The ankh symbol (☥)."
      ],
      "id": "en-tau-en-noun-HBuXMgw-",
      "links": [
        [
          "ankh",
          "ankh"
        ],
        [
          "☥",
          "☥"
        ]
      ],
      "synonyms": [
        {
          "word": "crux ansata"
        }
      ]
    },
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Astronomy",
          "orig": "en:Astronomy",
          "parents": [
            "Sciences",
            "Space",
            "All topics",
            "Nature",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Chiefly written τ: used to designate the nineteenth star (usually according to brightness) in a constellation."
      ],
      "id": "en-tau-en-noun-JBrG7GC-",
      "links": [
        [
          "astronomy",
          "astronomy"
        ],
        [
          "written",
          "write#Verb"
        ],
        [
          "designate",
          "designate#Verb"
        ],
        [
          "star",
          "star#Noun"
        ],
        [
          "brightness",
          "brightness#English"
        ],
        [
          "constellation",
          "constellation#English"
        ]
      ],
      "raw_glosses": [
        "(astronomy) Chiefly written τ: used to designate the nineteenth star (usually according to brightness) in a constellation."
      ],
      "topics": [
        "astronomy",
        "natural-sciences"
      ]
    },
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Finance",
          "orig": "en:Finance",
          "parents": [
            "Business",
            "Economics",
            "Society",
            "Social sciences",
            "All topics",
            "Sciences",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A measurement of the sensitivity of the value of an option to changes in the implied volatility of the price of the underlying asset."
      ],
      "id": "en-tau-en-noun-TLBpUwl2",
      "links": [
        [
          "finance",
          "finance#Noun"
        ],
        [
          "measurement",
          "measurement"
        ],
        [
          "sensitivity",
          "sensitivity"
        ],
        [
          "value",
          "value#Noun"
        ],
        [
          "option",
          "option#Noun"
        ],
        [
          "changes",
          "change#Noun"
        ],
        [
          "implied",
          "implied"
        ],
        [
          "volatility",
          "volatility"
        ],
        [
          "price",
          "price#Noun"
        ],
        [
          "underlying",
          "underlying#Adjective"
        ],
        [
          "asset",
          "asset"
        ]
      ],
      "raw_glosses": [
        "(finance) A measurement of the sensitivity of the value of an option to changes in the implied volatility of the price of the underlying asset."
      ],
      "synonyms": [
        {
          "word": "kappa"
        },
        {
          "word": "vega"
        }
      ],
      "topics": [
        "business",
        "finance"
      ]
    },
    {
      "categories": [
        {
          "kind": "other",
          "name": "English neologisms",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Mathematics",
          "orig": "en:Mathematics",
          "parents": [
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Chiefly written τ: an irrational and transcendental constant representing the ratio of the circumference of a Euclidean circle to its radius, equal to twice the value of pi (2π; approximately 6.2831853071)."
      ],
      "id": "en-tau-en-noun-Y9xgHUAj",
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "irrational",
          "irrational#Adjective"
        ],
        [
          "transcendental",
          "transcendental#Adjective"
        ],
        [
          "constant",
          "constant#Noun"
        ],
        [
          "represent",
          "represent"
        ],
        [
          "ratio",
          "ratio"
        ],
        [
          "circumference",
          "circumference"
        ],
        [
          "Euclidean",
          "Euclidean"
        ],
        [
          "circle",
          "circle#Noun"
        ],
        [
          "radius",
          "radius"
        ],
        [
          "equal",
          "equal#Adjective"
        ],
        [
          "twice",
          "twice"
        ],
        [
          "value",
          "value#Noun"
        ],
        [
          "pi",
          "pi"
        ],
        [
          "2",
          "2"
        ],
        [
          "π",
          "π#Ancient Greek"
        ],
        [
          "approximately",
          "approximately"
        ]
      ],
      "raw_glosses": [
        "(mathematics, neologism) Chiefly written τ: an irrational and transcendental constant representing the ratio of the circumference of a Euclidean circle to its radius, equal to twice the value of pi (2π; approximately 6.2831853071)."
      ],
      "tags": [
        "neologism"
      ],
      "topics": [
        "mathematics",
        "sciences"
      ]
    },
    {
      "alt_of": [
        {
          "extra": "a protein abundant especially in the neurons of the human central nervous system that stabilizes microtubules, and when misfolded is associated with forms of dementia such as Alzheimer's and Parkinson's diseases",
          "word": "tau protein"
        }
      ],
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Neurology",
          "orig": "en:Neurology",
          "parents": [
            "Medicine",
            "Neuroscience",
            "Biology",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "_dis": "17 3 17 17 4 4 2 2 17 11 8",
          "kind": "other",
          "name": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "ref": "1999, Matt Ridley, Genome: The Autobiography of a Species in 23 Chapters, London: Harper Perennial, published 2004, page 263",
          "text": "Quite what that job is remains obscure, but one theory is that it is to stabilise another protein called tau, which is supposed in turn to keep in shape the tubular ‘skeleton’ of a neuron.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Short for tau protein (“a protein abundant especially in the neurons of the human central nervous system that stabilizes microtubules, and when misfolded is associated with forms of dementia such as Alzheimer's and Parkinson's diseases”)."
      ],
      "id": "en-tau-en-noun-ZFfnF8AT",
      "links": [
        [
          "neurology",
          "neurology"
        ],
        [
          "tau protein",
          "tau protein#English"
        ],
        [
          "protein",
          "protein"
        ],
        [
          "abundant",
          "abundant"
        ],
        [
          "neuron",
          "neuron"
        ],
        [
          "human",
          "human#Adjective"
        ],
        [
          "central nervous system",
          "central nervous system"
        ],
        [
          "stabilize",
          "stabilize"
        ],
        [
          "microtubule",
          "microtubule"
        ],
        [
          "misfolded",
          "misfold#Verb"
        ],
        [
          "associated",
          "associate#Verb"
        ],
        [
          "forms",
          "form#Noun"
        ],
        [
          "dementia",
          "dementia"
        ],
        [
          "Alzheimer's",
          "Alzheimer's disease"
        ],
        [
          "Parkinson's diseases",
          "Parkinson's disease"
        ]
      ],
      "raw_glosses": [
        "(neurology) Short for tau protein (“a protein abundant especially in the neurons of the human central nervous system that stabilizes microtubules, and when misfolded is associated with forms of dementia such as Alzheimer's and Parkinson's diseases”)."
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ],
      "topics": [
        "medicine",
        "neurology",
        "neuroscience",
        "sciences"
      ],
      "translations": [
        {
          "_dis1": "9 2 6 6 3 1 1 1 37 16 18",
          "code": "fr",
          "lang": "French",
          "sense": "short for tau protein — see also tau protein",
          "tags": [
            "feminine"
          ],
          "word": "tau"
        }
      ]
    },
    {
      "alt_of": [
        {
          "extra": "(“an unstable elementary particle which is a type of lepton, having a mass almost twice that of a proton, a negative charge, and a spin of ½; it decays into hadrons (usually pions) or other leptons, and neutrinos; a tauon”)",
          "word": "tau lepton or tau particle"
        }
      ],
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Subatomic particles",
          "orig": "en:Subatomic particles",
          "parents": [
            "Matter",
            "Particle physics",
            "Chemistry",
            "Nature",
            "Physics",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "_dis": "17 3 17 17 4 4 2 2 17 11 8",
          "kind": "other",
          "name": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "19 3 9 9 4 3 2 2 12 29 9",
          "kind": "topical",
          "langcode": "en",
          "name": "Leptons",
          "orig": "en:Leptons",
          "parents": [
            "Fermions",
            "Subatomic particles",
            "Matter",
            "Particle physics",
            "Chemistry",
            "Nature",
            "Physics",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "Chiefly written τ.",
        "Short for tau lepton or tau particle (“an unstable elementary particle which is a type of lepton, having a mass almost twice that of a proton, a negative charge, and a spin of ½; it decays into hadrons (usually pions) or other leptons, and neutrinos; a tauon”)."
      ],
      "id": "en-tau-en-noun-ON2Df9AC",
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "tau lepton",
          "tau lepton#English"
        ],
        [
          "unstable",
          "unstable"
        ],
        [
          "elementary particle",
          "elementary particle"
        ],
        [
          "type",
          "type#Noun"
        ],
        [
          "lepton",
          "lepton"
        ],
        [
          "having",
          "have#Verb"
        ],
        [
          "mass",
          "mass#Noun"
        ],
        [
          "twice",
          "twice"
        ],
        [
          "proton",
          "proton"
        ],
        [
          "negative",
          "negative#Adjective"
        ],
        [
          "charge",
          "charge#Noun"
        ],
        [
          "spin",
          "spin#Noun"
        ],
        [
          "½",
          "½"
        ],
        [
          "decays",
          "decay#Verb"
        ],
        [
          "hadron",
          "hadron"
        ],
        [
          "pion",
          "pion"
        ],
        [
          "neutrino",
          "neutrino"
        ],
        [
          "tauon",
          "tauon"
        ]
      ],
      "raw_glosses": [
        "(physics) Chiefly written τ.",
        "Short for tau lepton or tau particle (“an unstable elementary particle which is a type of lepton, having a mass almost twice that of a proton, a negative charge, and a spin of ½; it decays into hadrons (usually pions) or other leptons, and neutrinos; a tauon”)."
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    },
    {
      "alt_of": [
        {
          "word": "tau meson"
        },
        {
          "word": "now known as a kaon"
        }
      ],
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Subatomic particles",
          "orig": "en:Subatomic particles",
          "parents": [
            "Matter",
            "Particle physics",
            "Chemistry",
            "Nature",
            "Physics",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Chiefly written τ.",
        "Short for tau meson, now known as a kaon."
      ],
      "id": "en-tau-en-noun-8bZwf2rc",
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "tau meson",
          "tau meson#English"
        ],
        [
          "known",
          "know#Verb"
        ],
        [
          "kaon",
          "kaon"
        ]
      ],
      "raw_glosses": [
        "(physics) Chiefly written τ.",
        "(historical) Short for tau meson, now known as a kaon."
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "historical"
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/taʊ/",
      "tags": [
        "Received-Pronunciation"
      ]
    },
    {
      "ipa": "/tɔː/",
      "tags": [
        "Received-Pronunciation"
      ]
    },
    {
      "ipa": "/taʊ/",
      "tags": [
        "General-American"
      ]
    },
    {
      "ipa": "/tɔ/",
      "tags": [
        "General-American"
      ]
    },
    {
      "rhymes": "-aʊ"
    },
    {
      "rhymes": "-ɔː"
    },
    {
      "audio": "En-us-tau.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/c/c6/En-us-tau.ogg/En-us-tau.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/c/c6/En-us-tau.ogg",
      "tags": [
        "General-American"
      ],
      "text": "Audio (GA)"
    }
  ],
  "translations": [
    {
      "_dis1": "9 2 36 36 2 1 0 0 6 5 3",
      "code": "fr",
      "lang": "French",
      "sense": "Saint Anthony’s cross — see also Saint Anthony's cross",
      "tags": [
        "feminine"
      ],
      "word": "croix en tau"
    },
    {
      "_dis1": "9 2 36 36 2 1 0 0 6 5 3",
      "code": "de",
      "lang": "German",
      "sense": "Saint Anthony’s cross — see also Saint Anthony's cross",
      "tags": [
        "neuter"
      ],
      "word": "Taukreuz"
    }
  ],
  "wikipedia": [
    "Hospital Brothers of Saint Anthony",
    "Trần Thanh Vân"
  ],
  "word": "tau"
}
{
  "categories": [
    "English 1-syllable words",
    "English coinages",
    "English countable nouns",
    "English entries with incorrect language header",
    "English entries with language name categories using raw markup",
    "English entries with topic categories using raw markup",
    "English lemmas",
    "English nouns",
    "English terms derived from Ancient Greek",
    "English terms derived from Hebrew",
    "English terms derived from Latin",
    "English terms derived from Middle English",
    "English terms derived from the shape of letters",
    "English terms inherited from Middle English",
    "English terms with IPA pronunciation",
    "English terms with audio links",
    "English terms with non-redundant non-automated sortkeys",
    "Pages with raw sortkeys",
    "Rhymes:English/aʊ",
    "Rhymes:English/ɔː",
    "en:Greek letter names",
    "en:Leptons"
  ],
  "derived": [
    {
      "word": "tau bone"
    },
    {
      "word": "tau cross"
    },
    {
      "word": "tau effect"
    },
    {
      "word": "tau lepton"
    },
    {
      "word": "tau meson"
    },
    {
      "word": "tau neutrino"
    },
    {
      "word": "tauon"
    },
    {
      "word": "tauopathy"
    },
    {
      "word": "tau particle"
    },
    {
      "word": "tau protein"
    },
    {
      "word": "tau staff"
    },
    {
      "word": "tau tangle"
    }
  ],
  "etymology_templates": [
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      "args": {},
      "expansion": "|",
      "name": "!"
    },
    {
      "args": {},
      "expansion": "|",
      "name": "!"
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    {
      "args": {},
      "expansion": "|",
      "name": "!"
    },
    {
      "args": {},
      "expansion": "|",
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    },
    {
      "args": {},
      "expansion": "|",
      "name": "!"
    },
    {
      "args": {},
      "expansion": "|",
      "name": "!"
    },
    {
      "args": {
        "current": "",
        "footer": "Wikipedia article on tau",
        "next": "→\n upsilon",
        "previous": "←\n sigma",
        "text": "<big>Τ τ </big>\nAncient Greek: ταῦ",
        "title": "Ancient Greek Alphabet"
      },
      "expansion": "",
      "name": "sequence box"
    },
    {
      "args": {
        "1": "sigma",
        "2": "",
        "3": "upsilon",
        "4": "ταῦ",
        "5": "Τ",
        "6": "τ"
      },
      "expansion": "",
      "name": "letter_disp2"
    },
    {
      "args": {
        "1": "grc",
        "2": "π"
      },
      "expansion": "π",
      "name": "lang"
    },
    {
      "args": {
        "1": "grc",
        "2": "τ"
      },
      "expansion": "τ",
      "name": "lang"
    },
    {
      "args": {
        "1": "en",
        "2": "enm",
        "3": "tau"
      },
      "expansion": "Middle English tau",
      "name": "inh"
    },
    {
      "args": {
        "1": "enm",
        "2": "taue"
      },
      "expansion": "taue",
      "name": "m"
    },
    {
      "args": {
        "1": "en",
        "2": "la",
        "3": "tau"
      },
      "expansion": "Latin tau",
      "name": "der"
    },
    {
      "args": {
        "1": "en",
        "2": "grc",
        "3": "ταῦ"
      },
      "expansion": "Ancient Greek ταῦ (taû)",
      "name": "der"
    },
    {
      "args": {
        "1": "en",
        "2": "he",
        "3": "תָּו",
        "tr": "tav"
      },
      "expansion": "Hebrew תָּו (tav)",
      "name": "der"
    },
    {
      "args": {
        "1": "grc",
        "2": "π"
      },
      "expansion": "π",
      "name": "lang"
    },
    {
      "args": {
        "1": "grc",
        "2": "τ"
      },
      "expansion": "τ",
      "name": "lang"
    },
    {
      "args": {
        "1": "grc",
        "2": "π"
      },
      "expansion": "π",
      "name": "lang"
    },
    {
      "args": {
        "1": "grc",
        "2": "τ"
      },
      "expansion": "τ",
      "name": "lang"
    },
    {
      "args": {
        "1": "en",
        "2": "t"
      },
      "expansion": "t",
      "name": "m"
    },
    {
      "args": {
        "1": "en",
        "2": "turn"
      },
      "expansion": "turn",
      "name": "m"
    },
    {
      "args": {
        "1": "grc",
        "2": "π"
      },
      "expansion": "π",
      "name": "lang"
    },
    {
      "args": {
        "1": "grc",
        "2": "τ"
      },
      "expansion": "τ",
      "name": "lang"
    },
    {
      "args": {
        "1": "grc",
        "2": "τ"
      },
      "expansion": "τ",
      "name": "lang"
    },
    {
      "args": {
        "1": "grc",
        "2": "τ"
      },
      "expansion": "τ",
      "name": "lang"
    },
    {
      "args": {
        "1": "grc",
        "2": "τ"
      },
      "expansion": "τ",
      "name": "lang"
    },
    {
      "args": {
        "1": "en",
        "2": "Martin Lewis Perl",
        "nat": "the American",
        "nobycat": "1",
        "nocap": "1",
        "occ": "physicist"
      },
      "expansion": "coined by the American physicist Martin Lewis Perl",
      "name": "coinage"
    },
    {
      "args": {
        "1": "grc",
        "2": "τρίτον",
        "t": "third"
      },
      "expansion": "Ancient Greek τρίτον (tríton, “third”)",
      "name": "noncog"
    },
    {
      "args": {
        "1": "grc",
        "2": "τριτον"
      },
      "expansion": "τριτον",
      "name": "lang"
    }
  ],
  "etymology_text": "From Middle English tau, taue, from Latin tau, from Ancient Greek ταῦ (taû) and Hebrew תָּו (tav)\nSense 6 (“mathematical constant equal to 2π”) was used by Joseph M. Lindenberg in 1991, and popularized by the American educator and entrepreneur Michael Hartl in a 2010 paper which explains that τ resembles π; and that τ is the Greek equivalent of t, the first letter of turn, and 2π corresponds to one turn of a circle with a radius of one unit.\nSense 8.1 (“short for tau lepton or tau particle”) was coined by the American physicist Martin Lewis Perl (1927–2014) after the first letter of Ancient Greek τρίτον (tríton, “third”), since the tau lepton or tauon was the third charged lepton discovered.",
  "forms": [
    {
      "form": "taus",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "tau (plural taus)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "The letter Τ/τ in the Greek alphabet; being the nineteenth letter of the Classical and Modern Greek, and the twenty-first letter of the Old and Ancient Greek alphabets."
      ],
      "links": [
        [
          "letter",
          "letter#Noun"
        ],
        [
          "Τ",
          "Τ#Ancient Greek"
        ],
        [
          "τ",
          "τ#Ancient Greek"
        ],
        [
          "Greek",
          "Greek#Adjective"
        ],
        [
          "alphabet",
          "alphabet#Noun"
        ],
        [
          "nineteenth",
          "nineteenth"
        ],
        [
          "Classical",
          "Classical Greek"
        ],
        [
          "Modern Greek",
          "Modern Greek"
        ],
        [
          "twenty-first",
          "twenty-first"
        ],
        [
          "Old",
          "Old Greek"
        ],
        [
          "Ancient Greek",
          "Ancient Greek"
        ]
      ]
    },
    {
      "alt_of": [
        {
          "extra": "the 22nd and last letter of many Semitic alphabets/abjads, including Phoenician, Aramaic, Hebrew, Syriac, and Arabic",
          "word": "taw"
        }
      ],
      "categories": [
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "1847, Richard Edmund Tyrwhitt, Sermons Chiefly Expository, volume I, Oxford: John Henry Parker; F[rancis] and J[ohn] Rivington, London, page 366",
          "text": "Hence it appears that the spits, or skewers, on which and to which the lamb was fixed and fastened in order to be roasted, assumed the form of a cross, not such a tau-cross as is engraved in Dr. Oliver’s Historical Landmarks of Freemasonry, vol. i. p. 80. having three arms only like the Greek letter tau; but a cross like the ancient Hebrew tau, with four arms, though not necessarily all of equal length.",
          "type": "quotation"
        },
        {
          "ref": "1851, D[aniel] Rock, Hierurgia; or Transubstantiation, Invocation of Saints, Relics, and Purgatory, Besides Those Other Articles of Doctrine Set Forth in the Holy Sacrifice of the Mass, Expounded; […], 2nd edition, London: C. Dolman, […], page 350",
          "text": "In the Spanish translation of Sallust, by the Infant Don Gabriel in 1772, called the Infant Sallust, there is a curious dissertation by Father Perez Bayer on the resemblance between the ancient Hebrew and Phœnician alphabets, in which it is observed that the Hebrew Tau was written in pure Phœnician, […]",
          "type": "quotation"
        },
        {
          "ref": "2017, Piers Vaughan, Capitular Development Course, 2nd edition, Rose Circle Publications, page 135",
          "text": "The tau is both the 19ᵗʰ letter of the Greek alphabet, and also the 22ⁿᵈ letter of the Hebrew alphabet. In this context, the Hebrew tau or tav is more pertinent.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative form of taw; the 22nd and last letter of many Semitic alphabets/abjads, including Phoenician, Aramaic, Hebrew, Syriac, and Arabic."
      ],
      "links": [
        [
          "taw",
          "taw#English"
        ],
        [
          "Semitic",
          "Semitic"
        ],
        [
          "alphabet",
          "alphabet"
        ],
        [
          "abjad",
          "abjad"
        ],
        [
          "Phoenician",
          "Phoenician"
        ],
        [
          "Aramaic",
          "Aramaic"
        ],
        [
          "Hebrew",
          "Hebrew"
        ],
        [
          "Syriac",
          "Syriac"
        ],
        [
          "Arabic",
          "Arabic"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    },
    {
      "glosses": [
        "A Τ-shaped object or sign; a Saint Anthony's cross, sometimes regarded as a sacred symbol."
      ],
      "links": [
        [
          "shaped",
          "shaped#Adjective"
        ],
        [
          "object",
          "object#Noun"
        ],
        [
          "sign",
          "sign#Noun"
        ],
        [
          "Saint Anthony's cross",
          "Saint Anthony's cross"
        ],
        [
          "regarded",
          "regard#Verb"
        ],
        [
          "sacred",
          "sacred#Adjective"
        ],
        [
          "symbol",
          "symbol#Noun"
        ]
      ]
    },
    {
      "categories": [
        "en:Christianity"
      ],
      "glosses": [
        "A Τ-shaped object or sign; a Saint Anthony's cross, sometimes regarded as a sacred symbol.",
        "A crosier with a Τ-shaped head."
      ],
      "links": [
        [
          "shaped",
          "shaped#Adjective"
        ],
        [
          "object",
          "object#Noun"
        ],
        [
          "sign",
          "sign#Noun"
        ],
        [
          "Saint Anthony's cross",
          "Saint Anthony's cross"
        ],
        [
          "regarded",
          "regard#Verb"
        ],
        [
          "sacred",
          "sacred#Adjective"
        ],
        [
          "symbol",
          "symbol#Noun"
        ],
        [
          "Christianity",
          "Christianity"
        ],
        [
          "crosier",
          "crosier"
        ],
        [
          "head",
          "head#Noun"
        ]
      ],
      "raw_glosses": [
        "A Τ-shaped object or sign; a Saint Anthony's cross, sometimes regarded as a sacred symbol.",
        "(Christianity) A crosier with a Τ-shaped head."
      ],
      "topics": [
        "Christianity"
      ]
    },
    {
      "glosses": [
        "The ankh symbol (☥)."
      ],
      "links": [
        [
          "ankh",
          "ankh"
        ],
        [
          "☥",
          "☥"
        ]
      ],
      "synonyms": [
        {
          "word": "crux ansata"
        }
      ]
    },
    {
      "categories": [
        "en:Astronomy"
      ],
      "glosses": [
        "Chiefly written τ: used to designate the nineteenth star (usually according to brightness) in a constellation."
      ],
      "links": [
        [
          "astronomy",
          "astronomy"
        ],
        [
          "written",
          "write#Verb"
        ],
        [
          "designate",
          "designate#Verb"
        ],
        [
          "star",
          "star#Noun"
        ],
        [
          "brightness",
          "brightness#English"
        ],
        [
          "constellation",
          "constellation#English"
        ]
      ],
      "raw_glosses": [
        "(astronomy) Chiefly written τ: used to designate the nineteenth star (usually according to brightness) in a constellation."
      ],
      "topics": [
        "astronomy",
        "natural-sciences"
      ]
    },
    {
      "categories": [
        "en:Finance"
      ],
      "glosses": [
        "A measurement of the sensitivity of the value of an option to changes in the implied volatility of the price of the underlying asset."
      ],
      "links": [
        [
          "finance",
          "finance#Noun"
        ],
        [
          "measurement",
          "measurement"
        ],
        [
          "sensitivity",
          "sensitivity"
        ],
        [
          "value",
          "value#Noun"
        ],
        [
          "option",
          "option#Noun"
        ],
        [
          "changes",
          "change#Noun"
        ],
        [
          "implied",
          "implied"
        ],
        [
          "volatility",
          "volatility"
        ],
        [
          "price",
          "price#Noun"
        ],
        [
          "underlying",
          "underlying#Adjective"
        ],
        [
          "asset",
          "asset"
        ]
      ],
      "raw_glosses": [
        "(finance) A measurement of the sensitivity of the value of an option to changes in the implied volatility of the price of the underlying asset."
      ],
      "synonyms": [
        {
          "word": "kappa"
        },
        {
          "word": "vega"
        }
      ],
      "topics": [
        "business",
        "finance"
      ]
    },
    {
      "categories": [
        "English neologisms",
        "en:Mathematics"
      ],
      "glosses": [
        "Chiefly written τ: an irrational and transcendental constant representing the ratio of the circumference of a Euclidean circle to its radius, equal to twice the value of pi (2π; approximately 6.2831853071)."
      ],
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "irrational",
          "irrational#Adjective"
        ],
        [
          "transcendental",
          "transcendental#Adjective"
        ],
        [
          "constant",
          "constant#Noun"
        ],
        [
          "represent",
          "represent"
        ],
        [
          "ratio",
          "ratio"
        ],
        [
          "circumference",
          "circumference"
        ],
        [
          "Euclidean",
          "Euclidean"
        ],
        [
          "circle",
          "circle#Noun"
        ],
        [
          "radius",
          "radius"
        ],
        [
          "equal",
          "equal#Adjective"
        ],
        [
          "twice",
          "twice"
        ],
        [
          "value",
          "value#Noun"
        ],
        [
          "pi",
          "pi"
        ],
        [
          "2",
          "2"
        ],
        [
          "π",
          "π#Ancient Greek"
        ],
        [
          "approximately",
          "approximately"
        ]
      ],
      "raw_glosses": [
        "(mathematics, neologism) Chiefly written τ: an irrational and transcendental constant representing the ratio of the circumference of a Euclidean circle to its radius, equal to twice the value of pi (2π; approximately 6.2831853071)."
      ],
      "tags": [
        "neologism"
      ],
      "topics": [
        "mathematics",
        "sciences"
      ]
    },
    {
      "alt_of": [
        {
          "extra": "a protein abundant especially in the neurons of the human central nervous system that stabilizes microtubules, and when misfolded is associated with forms of dementia such as Alzheimer's and Parkinson's diseases",
          "word": "tau protein"
        }
      ],
      "categories": [
        "English short forms",
        "English terms with quotations",
        "en:Neurology"
      ],
      "examples": [
        {
          "ref": "1999, Matt Ridley, Genome: The Autobiography of a Species in 23 Chapters, London: Harper Perennial, published 2004, page 263",
          "text": "Quite what that job is remains obscure, but one theory is that it is to stabilise another protein called tau, which is supposed in turn to keep in shape the tubular ‘skeleton’ of a neuron.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Short for tau protein (“a protein abundant especially in the neurons of the human central nervous system that stabilizes microtubules, and when misfolded is associated with forms of dementia such as Alzheimer's and Parkinson's diseases”)."
      ],
      "links": [
        [
          "neurology",
          "neurology"
        ],
        [
          "tau protein",
          "tau protein#English"
        ],
        [
          "protein",
          "protein"
        ],
        [
          "abundant",
          "abundant"
        ],
        [
          "neuron",
          "neuron"
        ],
        [
          "human",
          "human#Adjective"
        ],
        [
          "central nervous system",
          "central nervous system"
        ],
        [
          "stabilize",
          "stabilize"
        ],
        [
          "microtubule",
          "microtubule"
        ],
        [
          "misfolded",
          "misfold#Verb"
        ],
        [
          "associated",
          "associate#Verb"
        ],
        [
          "forms",
          "form#Noun"
        ],
        [
          "dementia",
          "dementia"
        ],
        [
          "Alzheimer's",
          "Alzheimer's disease"
        ],
        [
          "Parkinson's diseases",
          "Parkinson's disease"
        ]
      ],
      "raw_glosses": [
        "(neurology) Short for tau protein (“a protein abundant especially in the neurons of the human central nervous system that stabilizes microtubules, and when misfolded is associated with forms of dementia such as Alzheimer's and Parkinson's diseases”)."
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ],
      "topics": [
        "medicine",
        "neurology",
        "neuroscience",
        "sciences"
      ]
    },
    {
      "alt_of": [
        {
          "extra": "(“an unstable elementary particle which is a type of lepton, having a mass almost twice that of a proton, a negative charge, and a spin of ½; it decays into hadrons (usually pions) or other leptons, and neutrinos; a tauon”)",
          "word": "tau lepton or tau particle"
        }
      ],
      "categories": [
        "English short forms",
        "en:Subatomic particles"
      ],
      "glosses": [
        "Chiefly written τ.",
        "Short for tau lepton or tau particle (“an unstable elementary particle which is a type of lepton, having a mass almost twice that of a proton, a negative charge, and a spin of ½; it decays into hadrons (usually pions) or other leptons, and neutrinos; a tauon”)."
      ],
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "tau lepton",
          "tau lepton#English"
        ],
        [
          "unstable",
          "unstable"
        ],
        [
          "elementary particle",
          "elementary particle"
        ],
        [
          "type",
          "type#Noun"
        ],
        [
          "lepton",
          "lepton"
        ],
        [
          "having",
          "have#Verb"
        ],
        [
          "mass",
          "mass#Noun"
        ],
        [
          "twice",
          "twice"
        ],
        [
          "proton",
          "proton"
        ],
        [
          "negative",
          "negative#Adjective"
        ],
        [
          "charge",
          "charge#Noun"
        ],
        [
          "spin",
          "spin#Noun"
        ],
        [
          "½",
          "½"
        ],
        [
          "decays",
          "decay#Verb"
        ],
        [
          "hadron",
          "hadron"
        ],
        [
          "pion",
          "pion"
        ],
        [
          "neutrino",
          "neutrino"
        ],
        [
          "tauon",
          "tauon"
        ]
      ],
      "raw_glosses": [
        "(physics) Chiefly written τ.",
        "Short for tau lepton or tau particle (“an unstable elementary particle which is a type of lepton, having a mass almost twice that of a proton, a negative charge, and a spin of ½; it decays into hadrons (usually pions) or other leptons, and neutrinos; a tauon”)."
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    },
    {
      "alt_of": [
        {
          "word": "tau meson"
        },
        {
          "word": "now known as a kaon"
        }
      ],
      "categories": [
        "English short forms",
        "English terms with historical senses",
        "en:Subatomic particles"
      ],
      "glosses": [
        "Chiefly written τ.",
        "Short for tau meson, now known as a kaon."
      ],
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "tau meson",
          "tau meson#English"
        ],
        [
          "known",
          "know#Verb"
        ],
        [
          "kaon",
          "kaon"
        ]
      ],
      "raw_glosses": [
        "(physics) Chiefly written τ.",
        "(historical) Short for tau meson, now known as a kaon."
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "historical"
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/taʊ/",
      "tags": [
        "Received-Pronunciation"
      ]
    },
    {
      "ipa": "/tɔː/",
      "tags": [
        "Received-Pronunciation"
      ]
    },
    {
      "ipa": "/taʊ/",
      "tags": [
        "General-American"
      ]
    },
    {
      "ipa": "/tɔ/",
      "tags": [
        "General-American"
      ]
    },
    {
      "rhymes": "-aʊ"
    },
    {
      "rhymes": "-ɔː"
    },
    {
      "audio": "En-us-tau.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/c/c6/En-us-tau.ogg/En-us-tau.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/c/c6/En-us-tau.ogg",
      "tags": [
        "General-American"
      ],
      "text": "Audio (GA)"
    }
  ],
  "translations": [
    {
      "code": "ar",
      "lang": "Arabic",
      "roman": "tāw",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "tags": [
        "masculine"
      ],
      "word": "تَاو"
    },
    {
      "code": "ca",
      "lang": "Catalan",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "tags": [
        "feminine"
      ],
      "word": "tau"
    },
    {
      "code": "zh",
      "lang": "Chinese Mandarin",
      "roman": "táo",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "word": "陶"
    },
    {
      "code": "zh",
      "lang": "Chinese Mandarin",
      "roman": "tào",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "word": "套"
    },
    {
      "code": "cs",
      "lang": "Czech",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "tags": [
        "neuter"
      ],
      "word": "tau"
    },
    {
      "code": "da",
      "lang": "Danish",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "tags": [
        "neuter"
      ],
      "word": "tau"
    },
    {
      "code": "nl",
      "lang": "Dutch",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "tags": [
        "feminine",
        "masculine"
      ],
      "word": "tau"
    },
    {
      "code": "eo",
      "lang": "Esperanto",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "word": "taŭo"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "word": "tau"
    },
    {
      "code": "fr",
      "lang": "French",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "tags": [
        "masculine"
      ],
      "word": "tau"
    },
    {
      "code": "ka",
      "lang": "Georgian",
      "roman": "ṭau",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "word": "ტაუ"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "tags": [
        "neuter"
      ],
      "word": "Tau"
    },
    {
      "code": "el",
      "lang": "Greek",
      "roman": "taf",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "tags": [
        "neuter"
      ],
      "word": "ταυ"
    },
    {
      "code": "grc",
      "lang": "Ancient Greek",
      "roman": "taû",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "tags": [
        "neuter"
      ],
      "word": "ταῦ"
    },
    {
      "code": "he",
      "lang": "Hebrew",
      "roman": "tau",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "tags": [
        "feminine"
      ],
      "word": "טָאוּ"
    },
    {
      "code": "hu",
      "lang": "Hungarian",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "word": "tau"
    },
    {
      "code": "is",
      "lang": "Icelandic",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "tags": [
        "neuter"
      ],
      "word": "tá"
    },
    {
      "code": "ia",
      "lang": "Interlingua",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "word": "tau"
    },
    {
      "code": "it",
      "lang": "Italian",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "tags": [
        "feminine",
        "masculine"
      ],
      "word": "tau"
    },
    {
      "code": "ja",
      "lang": "Japanese",
      "roman": "tau",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "word": "タウ"
    },
    {
      "code": "ko",
      "lang": "Korean",
      "roman": "tau",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "word": "타우"
    },
    {
      "code": "ms",
      "lang": "Malay",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "word": "tau"
    },
    {
      "code": "nb",
      "lang": "Norwegian Bokmål",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "tags": [
        "neuter"
      ],
      "word": "tau"
    },
    {
      "code": "nn",
      "lang": "Norwegian Nynorsk",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "tags": [
        "neuter"
      ],
      "word": "tau"
    },
    {
      "code": "pl",
      "lang": "Polish",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "tags": [
        "neuter"
      ],
      "word": "tau"
    },
    {
      "code": "pt",
      "lang": "Portuguese",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "tags": [
        "masculine"
      ],
      "word": "tau"
    },
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "tau",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "tags": [
        "neuter"
      ],
      "word": "тау"
    },
    {
      "code": "es",
      "lang": "Spanish",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "tags": [
        "feminine"
      ],
      "word": "tau"
    },
    {
      "code": "sv",
      "lang": "Swedish",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "tags": [
        "neuter"
      ],
      "word": "tau"
    },
    {
      "code": "th",
      "lang": "Thai",
      "roman": "tao",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "word": "เทา"
    },
    {
      "code": "uk",
      "lang": "Ukrainian",
      "roman": "tau",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "tags": [
        "neuter"
      ],
      "word": "тау"
    },
    {
      "code": "cy",
      "lang": "Welsh",
      "sense": "the letter Τ/τ in the Greek alphabet",
      "tags": [
        "feminine"
      ],
      "word": "tau"
    },
    {
      "code": "fr",
      "lang": "French",
      "sense": "Saint Anthony’s cross — see also Saint Anthony's cross",
      "tags": [
        "feminine"
      ],
      "word": "croix en tau"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "Saint Anthony’s cross — see also Saint Anthony's cross",
      "tags": [
        "neuter"
      ],
      "word": "Taukreuz"
    },
    {
      "code": "fr",
      "lang": "French",
      "sense": "short for tau protein — see also tau protein",
      "tags": [
        "feminine"
      ],
      "word": "tau"
    }
  ],
  "wikipedia": [
    "Hospital Brothers of Saint Anthony",
    "Trần Thanh Vân"
  ],
  "word": "tau"
}
{
  "called_from": "page/2530",
  "msg": "skipping string in the middle of translations: a letter of many Semitic alphabets ",
  "path": [
    "tau"
  ],
  "section": "English",
  "subsection": "noun",
  "title": "tau",
  "trace": ""
}

{
  "called_from": "page/2530",
  "msg": "skipping string in the middle of translations: — ",
  "path": [
    "tau"
  ],
  "section": "English",
  "subsection": "noun",
  "title": "tau",
  "trace": ""
}

{
  "called_from": "page/2530",
  "msg": "skipping string in the middle of translations: see ",
  "path": [
    "tau"
  ],
  "section": "English",
  "subsection": "noun",
  "title": "tau",
  "trace": ""
}

{
  "called_from": "page/2530",
  "msg": "skipping string in the middle of translations: ankh symbol ",
  "path": [
    "tau"
  ],
  "section": "English",
  "subsection": "noun",
  "title": "tau",
  "trace": ""
}

{
  "called_from": "page/2530",
  "msg": "skipping string in the middle of translations: — ",
  "path": [
    "tau"
  ],
  "section": "English",
  "subsection": "noun",
  "title": "tau",
  "trace": ""
}

{
  "called_from": "page/2530",
  "msg": "skipping string in the middle of translations: see ",
  "path": [
    "tau"
  ],
  "section": "English",
  "subsection": "noun",
  "title": "tau",
  "trace": ""
}

{
  "called_from": "page/2530",
  "msg": "skipping string in the middle of translations: short for",
  "path": [
    "tau"
  ],
  "section": "English",
  "subsection": "noun",
  "title": "tau",
  "trace": ""
}

{
  "called_from": "page/2530",
  "msg": "skipping string in the middle of translations:  tau lepton ",
  "path": [
    "tau"
  ],
  "section": "English",
  "subsection": "noun",
  "title": "tau",
  "trace": ""
}

{
  "called_from": "page/2530",
  "msg": "skipping string in the middle of translations: or",
  "path": [
    "tau"
  ],
  "section": "English",
  "subsection": "noun",
  "title": "tau",
  "trace": ""
}

{
  "called_from": "page/2530",
  "msg": "skipping string in the middle of translations:  tau particle ",
  "path": [
    "tau"
  ],
  "section": "English",
  "subsection": "noun",
  "title": "tau",
  "trace": ""
}

{
  "called_from": "page/2530",
  "msg": "skipping string in the middle of translations: — ",
  "path": [
    "tau"
  ],
  "section": "English",
  "subsection": "noun",
  "title": "tau",
  "trace": ""
}

{
  "called_from": "page/2530",
  "msg": "skipping string in the middle of translations: see ",
  "path": [
    "tau"
  ],
  "section": "English",
  "subsection": "noun",
  "title": "tau",
  "trace": ""
}

This page is a part of the kaikki.org machine-readable English dictionary. This dictionary is based on structured data extracted on 2024-05-03 from the enwiktionary dump dated 2024-05-02 using wiktextract (f4fd8c9 and c9440ce). The data shown on this site has been post-processed and various details (e.g., extra categories) removed, some information disambiguated, and additional data merged from other sources. See the raw data download page for the unprocessed wiktextract data.

If you use this data in academic research, please cite Tatu Ylonen: Wiktextract: Wiktionary as Machine-Readable Structured Data, Proceedings of the 13th Conference on Language Resources and Evaluation (LREC), pp. 1317-1325, Marseille, 20-25 June 2022. Linking to the relevant page(s) under https://kaikki.org would also be greatly appreciated.