/ Thesaurus / M Synonyms of mentha longifolia Find synonyms for: Noun1. horsemint, Mentha longifolia, mintusage: a coarse Old World wild water mint having long leaves and spikelike clusters of flowers; naturalized in the eastern United StatesWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: jugular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language