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

Plesiosauri :: Plesiosauri (pl. ) of Plesiosauru.

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

Plesiosaurian :: Plesiosaurian (n.) A plesiosaur.

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..

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