Definitions

from the GNU version of the Collaborative International Dictionary of English

  • n.pl. An extinct group of marine reptiles, embracing both the Ichthyosauria and the Plesiosauria, now regarded as distinct orders.

from The Century Dictionary and Cyclopedia

  • A superordinal group of gigantic aquatic Mesozoic reptiles, with a very long body, naked leathery skin, paddle-like limbs, numerous teeth in long jaws, and biconcave vertebræ.

Etymologies

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