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Related to plesiosaurs: Pliosaurs, ichthyosaurs, Mosasaurs


 (plē′sē-ə-sôr′, plē′zē-)
n. pl. ple·si·o·saurs
Any of various extinct marine reptiles of the group Plesiosauria of the Mesozoic Era, having paddlelike limbs, a short tail, and sometimes a very long neck.

[New Latin Plēsiosaurus, type genus : Greek plēsios, near to; see pel- in Indo-European roots + Greek sauros, lizard.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Palaeontology) 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
[C19: from New Latin plēsiosaurus, from Greek plēsios near + sauros a lizard]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈpli si əˌsɔr)

any extinct marine reptile of the Jurassic and Cretaceous suborder Plesiosauroidea, having a thick body and paddlelike limbs.
[< New Latin Plesiosaurus (1821) genus name < Greek plēsí(os) near, close to + -o- -o- + saûros -saur]
ple`si•o•sau′roid, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.plesiosaur - extinct marine reptile with a small head on a long neck a short tail and four paddle-shaped limbsplesiosaur - extinct marine reptile with a small head on a long neck a short tail and four paddle-shaped limbs; of the Jurassic and Cretaceous
archosaur, archosaurian, archosaurian reptile - extinct reptiles including: dinosaurs; plesiosaurs; pterosaurs; ichthyosaurs; thecodonts
genus Plesiosaurus - a reptile genus of suborder Plesiosauria
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in classic literature ?
There were huge tortoises too, paddling about among these other reptiles, which Perry said were Plesiosaurs of the Lias.
The thing must have been sixteen or eighteen feet in length and closely resembled pictures I had seen of restored plesiosaurs of the lower Jurassic.
Plesiosaurs were huge marine reptiles that lived in seas throughout the entire planet inhabited the entire planet, with long necks, tiny heads, and sharp teeth.
Plesiosaurs were giant, four finned, and fierce looking marine carnivores that roamed the waters of Antarctica 150 million years ago.
(17) After giving an overview of "[t]he animals of the Mesozoic life" such as "reptiles with enormous bellies and small but strong legs and arms," "theromorpha," "plesiosaurs," "ichthysosaurs," "reptiles [that] were herbivorous animals...
The exhibition displays exciting remains of giant prehistoric reptiles, with ichthyosaurs, giant plesiosaurs, and mosasaurs.
Kaikaifilu's main prey was aristonectine plesiosaurs, long-necked marine reptiles that filter-fed much like baleen whales.
Driving across the North American Heartland, surrounded by prairie, it is almost impossible to imagine that once this was once a huge and relatively shallow inland sea called the Western Interior Seaway, an ancient body of water which split the entire continent of North America in half, and once teemed with predatory creatures ranging from fanged fish and turtles the size of small cars; to prowling sharks and giant squid; to hungry plesiosaurs and immense crocodiles.
Plesiosaurs didn't flap with all their flippers, nor did they use only their rear flippers to swim, the simulations suggest.
(1997): A new pistosaurid (Reptilia: Sauropterygia) from the Middle Triassic of Nevada and its implications for the origin of the plesiosaurs. Journal of Vertebrate Paleontology 17(3), 526-533.