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Related to thecodont: Heterodont


Any of various extinct early archosaurs that existed in the Permian and Triassic Periods and had teeth set in sockets rather than attached directly to the jaw. The group Thecodontia in which they were once placed is no longer in scientific use.

[New Latin Thēcodontia, order name : Greek thēkē, chest, sheath; see dhē- in Indo-European roots + Greek -odōn, -odont-, -odont.]


1. (Zoology) (of mammals and certain reptiles) having teeth that grow in sockets
2. (Zoology) of or relating to teeth of this type
(Palaeontology) 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
[C20: New Latin Thecondontia, from Greek thēkē case + -odont]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.thecodont - presumably in the common ancestral line to dinosaurs and crocodiles and birds
archosaur, archosaurian, archosaurian reptile - extinct reptiles including: dinosaurs; plesiosaurs; pterosaurs; ichthyosaurs; thecodonts
order Thecodontia, Thecodontia - extinct terrestrial reptiles having teeth set in sockets; of the late Permian to Triassic
References in periodicals archive ?
One forerunner of creatures, the Thecodont, a mammal-like reptile, morphed body type and frame to the dinosaur- like animal.
"But my conclusion has always been that the creature was a lizard thecodont from the Triassic period.