/ Dictionary / Index M marsh cress: Meaning and Definition of Find definitions for: marsh' cress" Pronunciation: [key] any cress belonging to the genus Rorippa, of the mustard family, esp. R. islandica, that grows in marshy areas in North America and Eurasia. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. marsh buggy marsh deer Related Content Daily Word Quiz: pristine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language