/ Thesaurus / O Synonyms of order therapsida Find synonyms for: Noun1. Therapsida, order Therapsida, animal orderusage: extinct mammal-like reptiles found inhabiting all continents from the mid Permian to late TriassicWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language