/ Dictionary / Index M marsh fern: Meaning and Definition of Find definitions for: marsh' fern" Pronunciation: [key] a fern, Thelypteris palustris, having pinnatifid fronds and growing in wet places. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. marsh elder Marshfield 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