ichthyosaur definitions

WordNet (r) 3.0 (2005)

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

Merriam Webster's

noun Etymology: ultimately from Greek ichthy- + sauros lizard Date: 1830 any of an order (Ichthyosauria) of extinct marine reptiles of the Mesozoic specialized for aquatic life by a streamlined body with a long snout, limbs reduced to small fins for steering, and a large lunate caudal fin • ichthyosaurian adjective or noun

Webster's 1913 Dictionary

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