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pelycosaur Syllabification: pel·y·co·saur
Pronunciation: /ˈpelikəˌsôr/

Definition of pelycosaur in English:


A large extinct reptile of the late Carboniferous and Permian periods, typically having a line of long bony spines along the back supporting a sail-like crest.
  • Order Pelycosauria, subclass Synapsida: several families and genera, including Dimetrodon and Edaphosaurus
Example sentences
  • Between the Carboniferous pelycosaurs and the first Jurassic mammals, the jaw articulation changed.
  • A characteristic pelycosaur was Dimetrodon, a large predator from the Permian of Texas.
  • Nevertheless these primitive animals were more advanced on the road the to mammalian evolution, and, like the pelycosaurs, diverged along several lines as herbivores, carnivores, or omnivores.


Late 19th century: from Greek pelux, peluk- 'bowl' + sauros 'lizard'.

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