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Any of various large reptilelike extinct tetrapods of the Carboniferous and Permian Periods, traditionally placed in the order Cotylosauria.

[Greek kotulē, hollow object, socket + Greek sauros, lizard.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Animals) any of various members of the extinct order of primitive and massive reptiles known as Cotylosauria, which lived between the Carboniferous and Triassic ages
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈkɒt l əˌsɔr)

any reptile of the extinct order Cotylosauria, comprising heavy-bodied splay-limbed forms that arose during the Pennsylvanian Period and that include the ancestors of all other reptiles.
[1900–05; < New Latin Cotylosauria < Greek kotýl(ē) socket, cup + New Latin -o- -o- + -sauria; see -saur, -ia]
cot`y•lo•sau′ri•an, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Ribera d'Urgellet area (Lleida Province), Pyrenean basin: Two large ichnofossils from the Permian locality of Palanca de Noves were described and referred tentatively to labyrinthodonts or cotylosaurs and to chirotheriid reptile trackmakers (Robles and Llompart, 1987).