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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
< Neo-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. 2014.
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British Dictionary definitions for plesiosauroid

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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plesiosauroid 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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Encyclopedia Article for plesiosauroid

plesiosaur

any of a group of long-necked marine reptiles found as fossils from the Late Triassic Period into the Late Cretaceous Period (215 million to 80 million years ago). Plesiosaurs had a wide distribution in European seas and around the Pacific Ocean, including Australia, North America, and Asia. Some forms known from North America and elsewhere persisted until near the end of the Cretaceous Period (65 million years ago).

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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