ˌ ̷ ̷ ̷ ̷ˈsȯrəs noun
Usage: capitalized
Etymology: New Latin, from Latin Mosa the river Meuse (near which the first known species was discovered) + New Latin -saurus
: a genus (the type of the family Mosasauridae) of large extinct aquatic Cretaceous fish-eating lizards related to the recent monitors but having the limbs modified into swimming paddles