from the GNU version of the Collaborative International Dictionary of English
- n.pl. An extinct order of Mesozoic marine reptiles including the genera Plesiosaurus, and allied forms; -- called also Sauropterygia.
from The Century Dictionary and Cyclopedia
- An order of extinct marine Reptilia, having the limbs fitted for swimming, the body fish-like, the neck long, and the head quite small.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. any of the plesiosaurs
Sorry, no etymologies found.
I do not know what Mr. Godwin Austin would say comes next, but probably rocks containing more ammonites, and more ichthyosauria and plesiosauria, with a vast number of other things; and under that I should meet with yet older rocks containing numbers of strange shells and fishes; and in thus passing from the surface to the lowest depths of the earth's crust, the forms of animal life and vegetable life which I should meet with in the successive beds would, looking at them broadly, be the more different the further that I went down.