| plesiosaur | <paleontology> One of the Plesiosauria. Source: Websters Dictionary (01 Mar 1998) |
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| plesiosauria | <paleontology> An extinct order of Mesozoic marine reptiles including the genera Plesiosaurus, and allied forms. Synonym: Sauropterygia. Origin: NL. See Plesiosaurus. Source: Websters Dictionary (01 Mar 1998) |
| plesiosaurian | <paleontology> A plesiosaur. Source: Websters Dictionary (01 Mar 1998) |
| plesiosaurus | Origin: NL, fr. Gr near + a lizard. <paleontology> 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. Source: Websters Dictionary (01 Mar 1998) |