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plesiosaur

[plee-see-uh-sawr] /ˈpli si əˌsɔr/
noun
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.
Origin of plesiosaur
< New Latin Plesiosaurus (1821), equivalent to Greek plēsí(os) near, close to + -o- -o- + saûros -saur; orig. so named because of its conjectured nearness to modern reptiles, relative to the ichthyosaurs
Related forms
plesiosauroid, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for plesiosaur

plesiosaur

/ˈpliːsɪəˌsɔː/
noun
1.
any of various extinct marine reptiles of the order Sauropterygia, esp any of the suborder Plesiosauria, of Jurassic and Cretaceous times, having a long neck, short tail, and paddle-like limbs See also ichthyosaur Compare dinosaur, pterosaur
Word Origin
C19: from New Latin plēsiosaurus, from Greek plēsios near + sauros a lizard
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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plesiosaur in Science
plesiosaur
  (plē'sē-ə-sôr')   
Any of various large, extinct marine reptiles of the genus Plesiosaurus and related genera of the Mesozoic Era. Most plesiosaurs had a small head on a long neck and a broad body with paddlelike limbs; one group had a large head on a short neck. The exact relationship between plesiosaurs and other reptiles is not known.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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