Plesiosaur meaning

plēsē-ə-sôr, plēzē-
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Any of an extinct group (order Sauropterygia) of large water reptiles of the Mesozoic Era, characterized by a small head, long neck, short tail, and four paddlelike limbs.
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Any of various large, extinct marine reptiles of the genus Plesiosaurus and related genera of the Mesozoic Era. Most plesiosaurs had a small head on a long neck and a broad body with paddlelike limbs; one group had a large head on a short neck. The exact relationship between plesiosaurs and other reptiles is not known.
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Any of several extinct marine reptiles, of the order Plesiosauria, from the Jurassic and Cretaceous periods. [from c. 1840]
noun
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Any of various extinct marine reptiles of the group Plesiosauria of the Mesozoic Era, having paddlelike limbs, a short tail, and sometimes a very long neck.
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Origin of plesiosaur

  • New Latin Plēsiosaurus type genus Greek plēsios near to pel-5 in Indo-European roots Greek sauros lizard

    From American Heritage Dictionary of the English Language, 5th Edition

  • plesio- +"Ž -saur

    From Wiktionary