PELYCOSAUR

pelycosaur

(noun) large primitive reptile having a tall spinal sail; of the Permian or late Paleozoic in Europe and North America

Source: WordNet® 3.1

Etymology

Noun

pelycosaur (plural pelycosaurs)

Any of a group of basal or primitive Late Paleozoic synapsid amniotes, part of a polyphyletic grade, formerly regarded as order Pelycosauria.

Source: Wiktionary

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