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plesiosauri |
1 definition found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Plesiosaurus \Ple`si*o*sau"rus\, n.; pl {Plesiosauri}. [NL., fr Gr ? near + ? a lizard.] (Paleon.) 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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