/ Thesaurus / T Synonyms of thelypteris palustris Find synonyms for: Noun1. marsh fern, Thelypteris palustris, Dryopteris thelypteris, fernusage: fern having pinnatifid fronds and growing in wet places; cosmopolitan in north temperate regionsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: opulent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language