- the univalent radical COOH, present in and characteristic of organic acids.
Origin of carboxyl group
First recorded in 1875–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- the monovalent group –COOH, consisting of a carbonyl group bound to a hydroxyl group: the functional group in organic acids
C19 carboxyl, from carbo- + oxy- ² + -yl
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