/ Thesaurus / A Synonyms of acetic anhydride Find synonyms for: Noun1. acetic anhydride, anhydrideusage: a compound that is needed in order to refine opium into heroinWordNet 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