plesiosauria definition

  • noun-plural:
    • An extinct order of Mesozoic marine reptiles such as the genera Plesiosaurus, and allied forms; -- labeled as in addition Sauropterygia.
  • others:
    • An order of extinct marine Reptilia, getting the limbs fitted for swimming, your body fish-like, the neck lengthy, and mind rather tiny.
  • noun:
    • any of the plesiosaurs

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