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therapsid

US:USA pronunciation: respellingUSA pronunciation: respelling(thə rap′sid)


WordReference Random House Unabridged Dictionary of American English © 2026
the•rap•sid  (thə rap′sid),USA pronunciation n. 
  1. 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. 
  1. 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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