/ Dictionary / Index M mosasaur: Meaning and Definition of Find definitions for: mo•sa•saur Pronunciation: (mō'su-sôr"), [key] — n. any of several extinct carnivorous marine lizards from the Cretaceous Period, having the limbs modified into broad, webbed paddles. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mosaic vision Mosbacher Related Content Daily Word Quiz: digression Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language