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.
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