-
nounlarge primitive reptile having a tall spinal sail; of the Permian or late Paleozoic in Europe and North Americatype of:
Definition that contains pelycosaur
- family edaphosauridae a family of reptiles of the order Pelycosauria
- genus dimetrodon a reptile genus of Pelycosauria
- edaphosauridae a family of reptiles of the order Pelycosauria