Definition of pelycosaur in English:


Line breaks: pelyco|saur
Pronunciation: /ˈpɛlɪkəsɔː


  • A large fossil 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
    More 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.


early 20th century: from Greek pelux, peluk- 'bowl' + sauros 'lizard'.

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