/ Thesaurus / T Synonyms of tannic acid Find synonyms for: Noun1. tannin, tannic acid, phenolusage: any of various complex phenolic substances of plant origin; used in tanning and in medicineWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: diaphanous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language