/ Thesaurus / R Synonyms of rattlesnake fern Find synonyms for: Noun1. rattlesnake fern, Botrychium virginianum, grape fernusage: American fern whose clustered sporangia resemble a snake's rattleWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: penurious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language