Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.


 (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.]


(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]


(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.
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
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.
The village is on the Midland Main Line, and Ivanhoe Line trains stop at the Barrow-upon-Soar railway station | | The village is famous for a plesiosaur excavated in a nearby limepit in 1851, nicknamed the 'Barrow Kipper'.
The team of paleontologists from the University of Bonn, Germany, with colleagues from Japan and France found that the oldest plesiosaur species ever discovered,&nbsp;moved through this unique form of&nbsp;underwater propulsion.
Other animals named after him include a weevil, a plesiosaur and a fish.
They include a 19-millionyear-old marsupial lion, an extinct grasshopper, a giant carnivorous pitcher plant, a tiny Australian spider, an Indonesian weevil, a plesiosaur, a blue-flowered central American plant, a "ghost" shrimp, and a Madagascan dragonfly - a larger close relative of the damselfly.
Pilosaurs were a type of plesiosaur, marine reptiles whose feet had evolved into four large flippers.
Fossil hunter Mary Anning's 1823 discovery of the first complete plesiosaur skeleton led to more than 190 years of arguing.
Maria Birmingham (Tastes Like Music) and Kids Can Press Editorial Director Yvette Ghione (with Daniel Loxton's Plesiosaur Peril) with the winner and shortlisted books in the adult category.
It was obvious the fossil was fingers or toes, because there were three in a row, but the first thing that came to mind was that it was some sort of plesiosaur.
The elusive Nessie is commonly portrayed as looking like a plesiosaur.