/ Dictionary / Index M marsh tacky: Meaning and Definition of Find definitions for: marsh' tack"y Pronunciation: [key] a small, sometimes half-wild horse of the coastal marshes. a poor white living in the marshes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Marsh's test marsh trefoil Related Content Daily Word Quiz: portent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language