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WordReference Random House Unabridged Dictionary of American English © 2024the•rap•sid (thə rap′sid),USA pronunciation n. - Paleontologyany 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. - Paleontologyof or pertaining to the Therapsida.
- Neo-Latin Therapsida (1905), equivalent. to Greek thēr- (stem of thé̄r wild beast) + apsid- (stem of apsís arch, vault, referring to the temporal arch of the skull) + Neo-Latin -a neuter plural ending (see -a1)
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