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Webster's 1913 Dictionary

HYDROXY-

HYDROXY- Hy *drox "y-. (Chem. )

Defn: A combining form, also used adjectively, indicating hydroxyl as an ingredient. 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.

New American Oxford Dictionary

hydroxy-

hydroxy- ▶comb. form Chemistry representing hydroxyl or hydroxide: hydroxyapatite.

Oxford Dictionary

hydroxy-

hydroxy- |hʌɪˈdrɒksi | ▶combining form Chemistry representing hydroxyl or hydroxide: hydroxyapatite.