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 plesiosauri is as below...

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

Plesiosauri :: Plesiosauri (pl. ) of Plesiosauru.

Plesiosaurian :: Plesiosaurian (n.) A plesiosaur.

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

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

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

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