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Definition of: plesiosaur
(plē′sē·ə·sôr) noun Paleontol.
Any of an extinct genus (Plesiosaurus) of fish–eating marine reptiles which flourished in the Jurassic period, having a small head, long neck, and limbs modified into swimming paddles. Also ple′si·o·sau′rus. [<Gk. plēsios near + sauros lizard]
(Up to 50 feet in length)
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