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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Hy·drox·y- Chem. 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.
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From: WordNet (r) 2.0

 hydroxy acid
      n : any acid that has hydroxyl groups in addition to the
          hydroxyl group in the acid itself