order Therapsida or·dert·he·rapsida uncommon noun 1. extinct mammal-like reptiles found inhabiting all continents from the mid Permian to late Triassic SynonymsTherapsidaorder Therapsida Related words Broader terms animal order Parts Synapsida Part of therapsidChronoperatesCynodontiaDicynodontia WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
