"light water" meaning in English

See light water in All languages combined, or Wiktionary

Noun

Etymology: By reference to atomic weight and atomic mass; more at light hydrogen. Head templates: {{en-noun|-}} light water (uncountable)
  1. (inorganic chemistry) Any water molecules (H₂O) containing two protium (¹H, hydrogen-1) atoms.
    Water in its usual form (as occurs in nature without human intervention), which is mostly of such form.
    Wikidata QID: Q3100716 Tags: uncountable Synonyms: diprotium monoxide Hypernyms: water, mul:H₂O, <, substance#Noun Related terms: lightwater [alternative], light-water [alternative] Coordinate_terms: heavy water, semi-heavy water, super-heavy water
    Sense id: en-light_water-en-noun-en:Q3100716 Categories (other): Inorganic compounds, English entries with incorrect language header, English retronyms, Pages with 1 entry, Pages with entries Disambiguation of English entries with incorrect language header: 37 37 27 Disambiguation of English retronyms: 36 36 27 Disambiguation of Pages with 1 entry: 37 38 25 Disambiguation of Pages with entries: 35 35 29 Topics: chemistry, inorganic-chemistry, natural-sciences, physical-sciences
  2. (inorganic chemistry) Any water molecules (H₂O) containing two protium (¹H, hydrogen-1) atoms.
    Water which has had even the usual small amount of deuterium removed (by human intervention): deuterium-depleted water.
    Wikidata QID: Q3100716, Q3819767 Tags: uncountable Synonyms: diprotium monoxide Hypernyms: water, mul:H₂O, <, substance#Noun Related terms: lightwater [alternative], light-water [alternative] Coordinate_terms: heavy water, semi-heavy water, super-heavy water
    Sense id: en-light_water-en-noun-en:Q31007161 Categories (other): Inorganic compounds, English entries with incorrect language header, English retronyms, Pages with 1 entry, Pages with entries, Water Disambiguation of English entries with incorrect language header: 37 37 27 Disambiguation of English retronyms: 36 36 27 Disambiguation of Pages with 1 entry: 37 38 25 Disambiguation of Pages with entries: 35 35 29 Disambiguation of Water: 34 58 8 Topics: chemistry, inorganic-chemistry, natural-sciences, physical-sciences
  3. Foam formed by water and any of various additives, used in firefighting because it floats on flammable liquids lighter than water. (The additives were originally fluorocarbon surfactants but today are increasingly fluorine-free.) Tags: uncountable Hypernyms: w:firefighting foam, <, foam#Noun
    Sense id: en-light_water-en-noun-en:type_of_firefighting_foam Categories (other): English entries with incorrect language header, English retronyms, Pages with 1 entry, Pages with entries, Firefighting Disambiguation of English entries with incorrect language header: 37 37 27 Disambiguation of English retronyms: 36 36 27 Disambiguation of Pages with 1 entry: 37 38 25 Disambiguation of Pages with entries: 35 35 29 Disambiguation of Firefighting: 6 6 89
The following are not (yet) sense-disambiguated
Derived forms (protium water): light water reactor Related terms (protium water): light hydrogen
Disambiguation of 'protium water': 44 44 11 Disambiguation of 'protium water': 44 44 11
{
  "derived": [
    {
      "_dis1": "44 44 11",
      "sense": "protium water",
      "word": "light water reactor"
    }
  ],
  "etymology_text": "By reference to atomic weight and atomic mass; more at light hydrogen.",
  "head_templates": [
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      "args": {
        "1": "-"
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      "expansion": "light water (uncountable)",
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  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "_dis1": "44 44 11",
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    }
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          "word": "semi-heavy water"
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        {
          "word": "super-heavy water"
        }
      ],
      "glosses": [
        "Any water molecules (H₂O) containing two protium (¹H, hydrogen-1) atoms.",
        "Water in its usual form (as occurs in nature without human intervention), which is mostly of such form."
      ],
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        {
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          "word": "mul:H₂O"
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        {
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      ],
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      "raw_glosses": [
        "(inorganic chemistry) Any water molecules (H₂O) containing two protium (¹H, hydrogen-1) atoms.",
        "Water in its usual form (as occurs in nature without human intervention), which is mostly of such form."
      ],
      "related": [
        {
          "tags": [
            "alternative"
          ],
          "word": "lightwater"
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        "en:water with the usual small amount of deuterium"
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        }
      ],
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        "uncountable"
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        "inorganic-chemistry",
        "natural-sciences",
        "physical-sciences"
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      "wikidata": [
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          "word": "heavy water"
        },
        {
          "word": "semi-heavy water"
        },
        {
          "word": "super-heavy water"
        }
      ],
      "glosses": [
        "Any water molecules (H₂O) containing two protium (¹H, hydrogen-1) atoms.",
        "Water which has had even the usual small amount of deuterium removed (by human intervention): deuterium-depleted water."
      ],
      "hypernyms": [
        {
          "word": "water"
        },
        {
          "word": "mul:H₂O"
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      ],
      "id": "en-light_water-en-noun-en:Q31007161",
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          "hydrogen-1"
        ]
      ],
      "raw_glosses": [
        "(inorganic chemistry) Any water molecules (H₂O) containing two protium (¹H, hydrogen-1) atoms.",
        "Water which has had even the usual small amount of deuterium removed (by human intervention): deuterium-depleted water."
      ],
      "related": [
        {
          "tags": [
            "alternative"
          ],
          "word": "lightwater"
        },
        {
          "tags": [
            "alternative"
          ],
          "word": "light-water"
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        "inorganic-chemistry",
        "natural-sciences",
        "physical-sciences"
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          "orig": "en:Firefighting",
          "parents": [],
          "source": "w+disamb"
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              4,
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          ],
          "ref": "2001, Roger C. Mardon, An Illustrated History of Fire Engines, →ISBN, page 112:",
          "text": "The light water (AFFF) of the TACR was to be backed up by fluorinated protein foam instead of standard protein foam.",
          "type": "quote"
        },
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          "bold_text_offsets": [
            [
              74,
              85
            ]
          ],
          "ref": "2014, John R. Ridley, Safety at Work, →ISBN, page 504:",
          "text": "These fires can be extinguished with water spray, alcohol-resistant foam, light water, vaporising liquids (\"Halons\"), carbon dioxide and dry powder.",
          "type": "quote"
        },
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          "ref": "2015, Phil Hughes, Ed Ferrett, Introduction to Health and Safety at Work, →ISBN:",
          "text": "They can be extinguished by carbon dioxide, dry powder, water spray, light water and vaporising liquid",
          "type": "quote"
        }
      ],
      "glosses": [
        "Foam formed by water and any of various additives, used in firefighting because it floats on flammable liquids lighter than water. (The additives were originally fluorocarbon surfactants but today are increasingly fluorine-free.)"
      ],
      "hypernyms": [
        {
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        },
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          "word": "<"
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          "word": "foam#Noun"
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      ],
      "id": "en-light_water-en-noun-en:type_of_firefighting_foam",
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          "additive#Noun"
        ],
        [
          "firefighting",
          "firefighting"
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          "float",
          "float"
        ],
        [
          "flammable",
          "flammable"
        ],
        [
          "liquid",
          "liquid"
        ],
        [
          "fluorocarbon",
          "fluorocarbon#English"
        ],
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          "surfactant",
          "surfactant#English"
        ]
      ],
      "senseid": [
        "en:type of firefighting foam"
      ],
      "tags": [
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      ]
    }
  ],
  "word": "light water"
}
{
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      "word": "light water reactor"
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  "head_templates": [
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        "Any water molecules (H₂O) containing two protium (¹H, hydrogen-1) atoms.",
        "Water in its usual form (as occurs in nature without human intervention), which is mostly of such form."
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      ],
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        "Any water molecules (H₂O) containing two protium (¹H, hydrogen-1) atoms.",
        "Water which has had even the usual small amount of deuterium removed (by human intervention): deuterium-depleted water."
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        "(inorganic chemistry) Any water molecules (H₂O) containing two protium (¹H, hydrogen-1) atoms.",
        "Water which has had even the usual small amount of deuterium removed (by human intervention): deuterium-depleted water."
      ],
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      ],
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        {
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    }
  ],
  "word": "light water"
}

Download raw JSONL data for light water meaning in English (4.5kB)


This page is a part of the kaikki.org machine-readable English dictionary. This dictionary is based on structured data extracted on 2025-10-04 from the enwiktionary dump dated 2025-09-20 using wiktextract (ea0d853 and 1ab82da). 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.