/ Thesaurus / W Synonyms of white arsenic Find synonyms for: Noun1. arsenic, arsenic trioxide, arsenous anhydride, arsenous oxide, white arsenic, ratsbane, trioxideusage: a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killerWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: pundit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language