Plesiosauria

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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]



From WordNet (r) 2.0 [wn]:

  Plesiosauria
       n : any of the plesiosaurs [syn: {suborder Plesiosauria}]