- any of various reptiles of the extinct order Thecodontia, occurring in the late Permian to late Triassic periods and characterized by teeth set in sockets.
- having the teeth set in sockets.
- belonging to or pertaining to the Thecodontia.
- (of mammals and certain reptiles) having teeth that grow in sockets
- of or relating to teeth of this type
- any extinct reptile of the order Thecodontia, of Triassic times, having teeth set in sockets: they gave rise to the dinosaurs, crocodiles, pterodactyls, and birds
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