Dictionarythe•rap•sidPronunciation: (thu-rap'sid), [key] —n. any of various groups of mammallike reptiles of the extinct order Therapsida, inhabiting all continents from mid-Permian to late Triassic times, some of which were probably warm-blooded and directly ancestral to mammals. —adj. of or pertaining to the Therapsida. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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