Plesiosaurus

2 definitions found

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

  Plesiosaurus \Ple`si*o*sau"rus\, n.; pl. {Plesiosauri}. [NL.,
     fr. Gr ? near + ? a lizard.] (Paleon.)
     A genus of large extinct marine reptiles, having a very long
     neck, a small head, and paddles for swimming. It lived in the
     Mesozoic age.
     [1913 Webster]



From WordNet (r) 2.0 [wn]:

  plesiosaurus
       n : extinct marine reptile with a small head on a long neck a
           short tail and four paddle-shaped limbs; of the Jurassic
           and Cretaceous [syn: {plesiosaur}]