From The Collaborative International Dictionary of English v.0.48 [gcide]:
Hydroxide \Hy*drox"ide\, noun [Hydro-, 2 + oxide.] (Chem.) A hydrate; a substance containing hydrogen and oxygen, made by combining water with an oxide, and yielding water by elimination. The hydroxides are regarded as compounds of hydroxyl, united usually with basic element or radical; as, calcium hydroxide ethyl hydroxide.
From WordNet (r) 3.0 (2006) [wn]:
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