mosasaur: Meaning and Definition of

mo•sa•saur

Pronunciation: (mō'su-sôr"), [key]
— n.
  1. any of several extinct carnivorous marine lizards from the Cretaceous Period, having the limbs modified into broad, webbed paddles.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.