Dictionary
ich•thy•o•saur
Pronunciation: (ik'thē-u-sôr"), [key]—
n.
any fishlike marine reptile of the extinct order Ichthyosauria, ranging from 4 to 40 ft. (1.2 to 12 m) in length and having a round, tapering body, a large head, four paddlelike flippers, and a vertical caudal fin.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.