/ Thesaurus / H Synonyms of hydroxyl group Find synonyms for: Noun1. hydroxyl, hydroxyl group, hydroxyl radical, group, radical, chemical groupusage: the monovalent group -OH in such compounds as bases and some acids and alcoholsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: verdant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language