ichthyosaur

from WordNet (r) 3.0 (2006)

ichthyosaur
    n 1: any of several marine reptiles of the Mesozoic having a
         body like a porpoise with dorsal and tail fins and paddle-
         shaped limbs

from The Collaborative International Dictionary of English v.0.48

Ichthyosaur \Ich"thy*o*saur\, n. [Cf. F. ichthyosaure.]
   (Paleon.)
   One of the Ichthyosaura.
   [1913 Webster]

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