Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of plesiosaur is as below...

Elasmosaurus :: Elasmosaurus (n.) An extinct, long-necked, marine, cretaceous reptile from Kansas, allied to Plesiosaurus..

Plesiosauria :: Plesiosauria (n. pl.) An extinct order of Mesozoic marine reptiles including the genera Plesiosaurus, and allied forms; -- called also Sauropterygia..

Plesiosaur :: Plesiosaur (n.) One of the Plesiosauria.

Pliosaurus :: Pliosaurus (n.) An extinct genus of marine reptiles allied to Plesiosaurus, but having a much shorter neck..

Plesiosaurus :: Plesiosaurus (n.) A genus of large extinct marine reptiles, having a very long neck, a small head, and paddles for swimming. It lived in the Mesozoic age..

Enaliosauria :: Enaliosauria (n. pl.) An extinct group of marine reptiles, embracing both the Ichthyosauria and the Plesiosauria, now regarded as distinct orders..

Plesiosauri :: Plesiosauri (pl. ) of Plesiosauru.

Sea Saurian :: Sea saurian (n.) Any marine saurian; esp. (Paleon.) the large extinct species of Mosasaurus, Icthyosaurus, Plesiosaurus, and related genera..

Sauropterygia :: Sauropterygia (n. pl.) Same as Plesiosauria.

Plesiosaurian :: Plesiosaurian (n.) A plesiosaur.

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