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H₂O

From Wiktionary, the free dictionary

Translingual

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Pronunciation

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  • English: (US) IPA(key): /ˌeɪt͡ʃtuːˈoʊ/
  • French: IPA(key): /aʃ.dø.zo/

Symbol

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H₂O

  1. (generally) Water (even if not chemically pure).
    • 1992, John R. Searle, The Rediscovery of the Mind (in English), →ISBN, page 157:
      A man may believe, for example, that the star in the sky is the Morning Star without believing that it is the Evening Star. A man may, for example, want to drink a glass of water without wanting to drink a glass of H₂O.
  2. (chemistry) A molecule of water.

Usage notes

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  • Deuterium should be named by the chemical symbol "2H", not "D".[1] Therefore, even heavy water (often called D2O) should properly be called H2O; 2H2O to be precise. Likewise, super-heavy water should be called 3H2O, not T2O.

Derived terms

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See also

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References

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English

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Etymology

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Two H initials (Hishammuddin Hussein) represented by H₂ + O for Onn, chosen to humorously match the chemical formula for water.

Pronunciation

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Proper noun

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H₂O

  1. (Malaysia, Internet slang, humorous, politics) Hishammuddin Hussein Onn, Malaysian politician and son of Hussein Onn, third prime minister of Malaysia.