(Chem.) A combining form, also used adjectively, indicating hydroxyl as an ingredient. [ 1913 Webster ]
Hydroxy acid (Chem.), an organic acid, having (besides the hydroxyl group of the carboxyl radical) an alcoholic hydroxyl group, and thus having the qualities of an alcohol in addition to its acid properties; as, lactic and tartaric acids are hydroxy acids. [ 1913 Webster ]
n. [ 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. [ 1913 Webster ]
n. [ Hydroxyl + amine. ] (Chem.) A nitrogenous, organic base, NH2.OH, resembling ammonia, and produced by a modified reduction of nitric acid. It is usually obtained as a volatile, unstable solution in water. It acts as a strong reducing agent. [ 1913 Webster ]
n. A crystalline amino acid (C5H9NO3), a hydroxylated proline, obtained by hydrolysis of gelatin or collagen. Chemically it is 4-hydroxy-L-proline. It is classified as nonessential for growth in rats. [ WordNet 1.5 +PJC ]
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