Sauropterygia

from WordNet (r) 3.0 (2006)

Sauropterygia
    n 1: extinct marine reptiles: plesiosaurs; nothosaurs [syn:
         {Sauropterygia}, {order Sauropterygia}]

from The Collaborative International Dictionary of English v.0.48

Sauropterygia \Sau*rop`te*ryg"i*a\, n. pl. [NL., fr. Gr. ? a
   lizard + ?, ?, a wing.] (Paleon.)
   Same as {Plesiosauria}.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Plesiosauria \Ple`si*o*sau"ri*a\, n. pl. [NL. See
   {Plesiosaurus}.] (Paleon.)
   An extinct order of Mesozoic marine reptiles including the
   genera Plesiosaurus, and allied forms; -- called also
   {{Sauropterygia}}.
   [1913 Webster]

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