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Definition 2022


H₂O

H₂O

Translingual

Symbol

H₂O

  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

Derived terms

  • H₃O+, H₃O, hydronium
  • OH-, OH, hydroxide
  • 2H₂O, H₄O₂, H₃OOH, H₃O-OH, hydronium hydroxide

Related terms

See also


English

Noun

H₂O (uncountable)

  1. Water as a chemical substance.
    • 1992, John R. Searle, The Rediscovery of the Mind, ISBN 9780262691543, 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.