/ Thesaurus Find synonyms for: Noun1. poison, toxicant, poisonous substance, substanceusage: any substance that causes injury or illness or death of a living organismAdjective1. poisonous, toxicant, toxic (vs. nontoxic)usage: having the qualities or effects of a poisonWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.See also: toxicant (Dictionary) Related Content Daily Word Quiz: quince Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language Synonyms Index