noun mo·sa·saur \ˈmō-zə-ˌsȯr\

Definition of mosasaur

  1. :  any of a family (Mosasauridae) of very large extinct marine fish-eating lizards of the Upper Cretaceous with limbs modified into paddles that are related to the recent monitor lizards

Origin and Etymology of mosasaur

New Latin Mosasaurus, from Latin Mosa the river Meuse + Greek sauros lizard

First Known Use: 1841

Learn More about mosasaur

Seen and Heard

What made you want to look up mosasaur? Please tell us where you read or heard it (including the quote, if possible).