/ Thesaurus / C Synonyms of class sphenopsida Find synonyms for: Noun1. Sphenopsida, class Sphenopsida, Equisetatae, class Equisetatae, classusage: horsetails and related formsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: effervescent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language