/ Thesaurus / M Synonyms of mercurialis perennis Find synonyms for: Noun1. dog's mercury, dog mercury, Mercurialis perennis, herb, herbaceous plantusage: European perennial weedy plant with greenish flowersWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: abyss Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language