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From The Collaborative International Dictionary of English v.0.44 [gcide]:
Hydroxyl \Hy*drox"yl\, noun [Hydro-, 2 + oxygen + -yl.] (Chem.) A compound radical, or unsaturated group, {HO}, consisting of one atom of hydrogen and one of oxygen. It is a characteristic part of the hydrates, the alcohols, the oxygen acids, etc.
From WordNet (r) 2.0 [wn]:
hydroxyl
noun: the monovalent group -OH in such compounds as bases and some acids and alcohols [syn: {hydroxyl group}, {hydroxyl radical}]
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