/ Thesaurus / P Synonyms of progymnosperm Find synonyms for: Noun1. progymnosperm, gymnospermusage: an ancestral fossil type from which modern gymnosperms are thought to have derivedWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language