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H₂O. In DICTIOUS you will not only get to know all the dictionary meanings for the word
H₂O, but we will also tell you about its etymology, its characteristics and you will know how to say
H₂O in singular and plural. Everything you need to know about the word
H₂O you have here. The definition of the word
H₂O will help you to be more precise and correct when speaking or writing your texts. Knowing the definition of
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Translingual
Pronunciation
Symbol
H₂O
- (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.
- (chemistry) (a molecule of) water
Usage notes
Deuterium should be called by the chemical symbol "2H", not "D". 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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References
English
Etymology
Two H initials (Hishammuddin Hussein) represented by H₂ + O for Onn, chosen to humorously match the chemical formula for water.
Pronunciation
Proper noun
H₂O
- (Malaysia, Internet slang, humorous, politics) Hishammuddin Hussein Onn, Malaysian politician and son of Hussein Onn, third prime minister of Malaysia.