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Definition of: ichthyosaurus
(ik′thē·ə·sôr′əs) noun plural ·sau·ri (-sôr′ī) Paleontol.
Any of an order (Ichthyosauria) of extinct marine reptiles of the Mesozoic era, having a porpoise-like form with four paddlelike limbs, a large, elongated head, long tail, and broad vertebrae resembling those of fishes. Also ich′thy·o·saur′. [<ICHTHYO- + Gk. sauros lizard]
(The largest are thought to have been about 30 feet long)
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