/ Thesaurus / O Synonyms of oxalic acid Find synonyms for: Noun1. oxalic acid, ethanedioic acid, acidusage: a toxic colorless crystalline organic acid found in oxalis and other plants; used as a bleach and rust remover and in chemical analysisWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language