pelycosaur

pelycosaur

[pel-i-kuh-sawr]
noun
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:
< Neo-Latin Pelycosauria (1878), equivalent to Greek pelyk-, stem of pélyx wooden bowl, cup (taken as meaning pelvis, parallel to the Neo-Latin sense of Latin pelvis) + -o- -o- + saûr(os) -saur + Neo-Latin -ia -ia; so named from the peculiar form of the ischium in such reptiles

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World English Dictionary
pelycosaur (ˈpɛlɪkəʊˌsɔː)
 
n
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
 
[C19: from New Latin Pelycosauria, from Greek pelyx bowl, pelvis, + -saur]

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