Definitions for "Plesiosaur"
Plesiosaur - A genus of marine reptiles (suborder Plesiosauria) of the Mesozoic of Europe and North America having a very long neck, a small head and limbs developed as paddles for swimming.
extinct marine reptile with a small head on a long neck a short tail and four paddle-shaped limbs; of the Jurassic and Cretaceous
A type of long-necked marine reptile
Keywords:  one
One of the Plesiosauria.