1. 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.
  1. having the teeth set in sockets.
  2. belonging to or pertaining to the Thecodontia.

Origin of thecodont

1830–40; < New Latin, equivalent to Greek thḗk(ē) case, chest (see theca) + -odont- -odont; so named from the sockets in which the marginal teeth were implanted Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for thecodont

Historical Examples of thecodont

British Dictionary definitions for thecodont


  1. (of mammals and certain reptiles) having teeth that grow in sockets
  2. of or relating to teeth of this type
  1. 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

Word Origin for thecodont

C20: New Latin Thecondontia, from Greek thēkē case + -odont
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

thecodont in Science


  1. Any of various extinct primitive archosaurs of the order Thecodontia of the late Permian and Triassic Periods. Thecodonts had teeth in sockets and were probably ancestral to the dinosaurs, pterosaurs, and crocodilians.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.