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the•rap•sid



Pronunciation: (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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