most therapsid


any 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.
of or pertaining to the Therapsida.

< Neo-Latin Therapsida (1905), equivalent to Greek thēr- (stem of thḗr wild beast) + apsid- (stem of apsís arch, vault, referring to the temporal arch of the skull) + Neo-Latin -a neuter plural ending (see -a1) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To most therapsid
World English Dictionary
therapsid (θəˈræpsɪd)
any extinct reptile of the order Therapsida, of Permian to Triassic times: considered to be the ancestors of mammals
[C20: from New Latin Therapsida, from Greek thēr beast + Latin apsis arch]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
American Heritage
Science Dictionary
therapsid  [%PREMIUM_LINK%]     (thə-rāp'sĭd)  Pronunciation Key 
An advanced type of synapsid reptile that evolved in the Permian Period. Therapsids further differentiated their dentition into nipping, biting, and crushing teeth, and (unlike diapsids) had forelimbs that were more greatly developed than hindlimbs. Therapsids include the so-called mammallike reptiles of the Permian and Triassic Periods, as well as mammals. Compare anapsid, diapsid, synapsid.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
Copyright © 2014, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature