- 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