/ Thesaurus / C Synonyms of carboxyl group Find synonyms for: Noun1. carboxyl, carboxyl group, group, radical, chemical groupusage: the univalent radical -COOH; present in and characteristic of organic acidsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: candid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language