/ Thesaurus / P Synonyms of poison mercury Find synonyms for: Noun1. poison ivy, markweed, poison mercury, poison oak, Toxicodendron radicans, Rhus radicans, poisonous plantusage: climbing plant common in eastern and central United States with ternate leaves and greenish flowers followed by white berries; yields an irritating oil that causes a rash on contactWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language