'Ichthyosaur' definitions:

Definition of 'ichthyosaur'

(from WordNet)
noun
Any of several marine reptiles of the Mesozoic having a body like a porpoise with dorsal and tail fins and paddle- shaped limbs

Definition of 'Ichthyosaur'

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