/ Dictionary / Index M marsh elder: Meaning and Definition of Find definitions for: marsh' el"der Pronunciation: [key] any of various composite plants of the genus Iva, as I. frutescens, that grow in salt marshes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. marsh deer marsh fern Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language