Pelycosaur (noun) Definition, Meaning & Examples

noun
  1. 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.
noun
  1. 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
Pelycosaur (noun) Definition, Meaning & Examples

More Definitions