Main Entry: mo·sa·saur

Pronunciation: \ˈmō-zə-ˌsȯr\

Function: noun

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

Date: 1841

: 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