[ pel-i-kuh-sawr ]
/ ˈpɛl ɪ kəˌsɔr /


any of a group of large primitive reptiles belonging to the extinct order Pelycosauria, abundant in North America and Europe during the Permian Period, often having a tall spinal sail.

Origin of pelycosaur

< New Latin Pelycosauria (1878), equivalent to Greek pelyk-, stem of pélyx wooden bowl, cup (taken as meaning pelvis, parallel to the New Latin sense of Latin pelvis) + -o- -o- + saûr(os) -saur + New Latin -ia -ia; so named from the peculiar form of the ischium in such reptiles Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for pelycosaur

/ (ˈpɛlɪkəʊˌsɔː) /


any extinct mammal-like reptile of the order Pelycosauria, of Upper Carboniferous to Lower Permian times, from which the therapsids are thought to have evolved

Word Origin for pelycosaur

C19: from New Latin Pelycosauria, from Greek pelyx bowl, pelvis, + -saur
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