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the·co·dont (thḗkə-dŏnt́)

[New Latin Thēcodontia, order name, Greek thēkē, chest, sheath, + Greek -odōn, -odont-, -odont.]

noun 

Any of various extinct primitive archosaurs of the order Thecodontia of the late Permian and Triassic periods, having teeth in sockets and probably ancestral to the dinosaurs.