plesiosauroid

plesiosaur

[plee-see-uh-sawr]
noun
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

plesiosauroid, adjective
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World English Dictionary
plesiosaur (ˈpliːsɪəˌsɔː)
 
n
See also ichthyosaur dinosaur Compare pterosaur 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
 
[C19: from New Latin plēsiosaurus, from Greek plēsios near + sauros a lizard]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
plesiosaur   (plē'sē-ə-sôr')  Pronunciation Key 
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.
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