• Webster's Revised Unabridged Dictionary
    • n. pl Mosasauria (Paleon) An order of large, extinct, marine reptiles, found in the Cretaceous rocks, especially in America. They were serpentlike in form and in having loosely articulated and dilatable jaws, with large recurved teeth, but they had paddlelike feet. Some of them were over fifty feet long. They are, essentially, fossil sea serpents with paddles. Called also Pythonomarpha, and Mosasauria.
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Century Dictionary and Cyclopedia
    • n mosasauria A group of remarkably long-bodied marine reptiles, from the Cretaceous rocks of Europe and America. It is typified by the genus Mosasaurus, which attained a length of over 13 feet and possessed some 100 or more vertebræ. The skull resembles that of the monitors in the large size of the nasal apertures and the fusion of the nasals into one narrow bone. Now called Pythonomorpha.
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Webster's Revised Unabridged Dictionary
NL. See Mosasaurus


In literature:

Maestricht lizards (Mosasauria); 51.
"The History of Creation, Vol. II (of 2)" by Ernst Haeckel