Breadcrumb Home > Thesaurus > P Synonyms of plant toxin Find synonyms for: Noun1. plant toxin, phytotoxin, toxinusage: any substance produced by plants that is similar in its properties to extracellular bacterial toxinWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. ✖ Related Content Daily Word Quiz: solecism Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language