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Any of various extinct carnivorous marine reptiles of the family Mosasauridae of the Cretaceous Period, having an elongated body, powerful jaws, and paddlelike limbs. Some species reached lengths of over 15 meters (50 feet).
[New Latin Mosasaurus, genus name : Latin Mosa, the Meuse River (where fossils of the genus were first discovered) + Greek sauros, lizard.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
n, pl -saurs or -sauri (-ˈsɔːraɪ)
(Palaeontology) any of various extinct Cretaceous giant marine lizards of the genus Mosasaurus and related genera, typically having paddle-like limbs
[C18: from Latin Mosa the river Meuse (near which remains were first found) + -saur]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
any of several extinct carnivorous marine lizards from the Cretaceous Period, having the limbs modified into broad, webbed paddles.
[< New Latin Mosasaurus (1823) genus name = Latin Mosa the Muse river (where first discovered) + New Latin -saurus -saur]
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