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  1. Water, by its molecular formula, although rarely pure.
  2. (chemistry) A molecule of water.
  3. (inorganic chemistry) light water, consisting of two protium isotope of hydrogen atoms and one oxygen atom

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H₂O (uncountable)

  1. (Should we delete(+) this sense?) Water as a chemical substance.
    • 1992, John R. Searle, The Rediscovery of the Mind, →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. (Malaysia, Internet slang, humorous, politics) Hishammuddin Hussein Onn, Malaysian politician and son of Hussein Onn, third prime minister of Malaysia.