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WordReference Random House Unabridged Dictionary of American English © 2024ple•si•o•saur (plē′sē ə sôr′),USA pronunciation n. - Paleontologyany marine reptile of the extinct genus Plesiosaurus, from the Jurassic and Cretaceous periods, having a small head, a long neck, four paddlelike limbs, and a short tail.
- Neo-Latin Plesiosaurus (1821), equivalent. to Greek plēsí(os) near, close to + -o- -o- + saûros -saur; origin, originally so named because of its conjectured nearness to modern reptiles, relative to the ichthyosaurs
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