Meaning of plesiosaur

ple•si•o•saur

Pronunciation: (plē'sē-u-sôr"), [key]
— n.
  1. any 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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