an organic acid containing both a carboxyl and a hydroxyl group.
any of a class of organic acids containing a hydroxyl group and showing properties of both an alcohol and an acid.
Origin of hydroxy acid
First recorded in 1895–1900
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
any acid, such as sulphuric acid, containing hydroxyl groups in its molecules
any of a class of carboxylic acids that contain both a hydroxyl group and a carboxyl group in their molecules
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012