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[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 Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for pelycosaur


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
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
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