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pelycosaur

[pel-i-kuh-sawr]
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noun
  1. 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.
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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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for pelycosaur

pelycosaur

noun
  1. 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
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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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012