"υ ψιλόν" meaning in Ancient Greek

{
  "etymology_text": "From υ (u) with ψιλόν (psilón) meaning \"plain\" or \"bare,\" indicating the common unaspirated variant of upsilon.",
  "forms": [
    {
      "form": "u psilón",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "υ ψιλόν",
        "g": "n"
      },
      "expansion": "υ ψιλόν • (u psilón) n (indeclinable)",
      "name": "grc-noun"
    }
  ],
  "lang": "Ancient Greek",
  "lang_code": "grc",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Ancient Greek entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Koine Greek",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "grc",
          "name": "Greek letter names",
          "orig": "grc:Greek letter names",
          "parents": [
            "Letter names",
            "Letters, symbols, and punctuation",
            "Names",
            "Orthography",
            "All topics",
            "Proper nouns",
            "Terms by semantic function",
            "Writing",
            "Fundamental",
            "Nouns",
            "Human behaviour",
            "Language",
            "Lemmas",
            "Human",
            "Communication"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The unaspirated form of the letter υ (upsilon) in the Ancient Greek alphabet."
      ],
      "id": "en-υ_ψιλόν-grc-noun-3Ii6lJMB",
      "links": [
        [
          "υ",
          "υ"
        ],
        [
          "upsilon",
          "upsilon"
        ],
        [
          "Ancient Greek",
          "Ancient Greek"
        ]
      ],
      "raw_glosses": [
        "(Koine) The unaspirated form of the letter υ (upsilon) in the Ancient Greek alphabet."
      ],
      "related": [
        {
          "word": "ὖ ψιλόν"
        },
        {
          "word": "ὗ"
        }
      ],
      "synonyms": [
        {
          "roman": "standard unaspirated form with ψιλόν",
          "word": "ὖ ψιλόν"
        },
        {
          "roman": "rare aspirated form with ψιλόν",
          "word": "ὗ ψιλόν"
        }
      ],
      "tags": [
        "Koine",
        "indeclinable"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/y psiˈlon/"
    },
    {
      "ipa": "/i psiˈlon/"
    },
    {
      "ipa": "/y psiˈlon/",
      "note": "1ˢᵗ CE Egyptian"
    },
    {
      "ipa": "/y psiˈlon/",
      "note": "4ᵗʰ CE Koine"
    },
    {
      "ipa": "/y psiˈlon/",
      "note": "10ᵗʰ CE Byzantine"
    },
    {
      "ipa": "/i psiˈlon/",
      "note": "15ᵗʰ CE Constantinopolitan"
    },
    {
      "other": "/i psiː'lɔːn/"
    }
  ],
  "word": "υ ψιλόν"
}

{
  "etymology_text": "From υ (u) with ψιλόν (psilón) meaning \"plain\" or \"bare,\" indicating the common unaspirated variant of upsilon.",
  "forms": [
    {
      "form": "u psilón",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "υ ψιλόν",
        "g": "n"
      },
      "expansion": "υ ψιλόν • (u psilón) n (indeclinable)",
      "name": "grc-noun"
    }
  ],
  "lang": "Ancient Greek",
  "lang_code": "grc",
  "pos": "noun",
  "related": [
    {
      "word": "ὖ ψιλόν"
    },
    {
      "word": "ὗ"
    }
  ],
  "senses": [
    {
      "categories": [
        "Ancient Greek entries with incorrect language header",
        "Ancient Greek indeclinable nouns",
        "Ancient Greek lemmas",
        "Ancient Greek multiword terms",
        "Ancient Greek neuter indeclinable nouns",
        "Ancient Greek neuter nouns",
        "Ancient Greek nouns",
        "Ancient Greek oxytone terms",
        "Ancient Greek terms with IPA pronunciation",
        "Koine Greek",
        "Pages with 1 entry",
        "Pages with entries",
        "grc:Greek letter names"
      ],
      "glosses": [
        "The unaspirated form of the letter υ (upsilon) in the Ancient Greek alphabet."
      ],
      "links": [
        [
          "υ",
          "υ"
        ],
        [
          "upsilon",
          "upsilon"
        ],
        [
          "Ancient Greek",
          "Ancient Greek"
        ]
      ],
      "raw_glosses": [
        "(Koine) The unaspirated form of the letter υ (upsilon) in the Ancient Greek alphabet."
      ],
      "tags": [
        "Koine",
        "indeclinable"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/y psiˈlon/"
    },
    {
      "ipa": "/i psiˈlon/"
    },
    {
      "ipa": "/y psiˈlon/",
      "note": "1ˢᵗ CE Egyptian"
    },
    {
      "ipa": "/y psiˈlon/",
      "note": "4ᵗʰ CE Koine"
    },
    {
      "ipa": "/y psiˈlon/",
      "note": "10ᵗʰ CE Byzantine"
    },
    {
      "ipa": "/i psiˈlon/",
      "note": "15ᵗʰ CE Constantinopolitan"
    },
    {
      "other": "/i psiː'lɔːn/"
    }
  ],
  "synonyms": [
    {
      "roman": "standard unaspirated form with ψιλόν",
      "word": "ὖ ψιλόν"
    },
    {
      "roman": "rare aspirated form with ψιλόν",
      "word": "ὗ ψιλόν"
    }
  ],
  "word": "υ ψιλόν"
}