Definition of pelycosaur in English:

pelycosaur

Line breaks: pelyco|saur
Pronunciation: /ˈpɛlɪkəsɔː
 
/

noun

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.

Origin

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

Definition of pelycosaur in:

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Word of the day apposite
Pronunciation: ˈapəzɪt
adjective
apt in the circumstances or relation to something