noun. The typical genus of Ichthyosauridæ. I. communis is one of the earliest- and best-known species.

noun. [l. c.; pl. ichthyosauri (-rī).] A species of the genus Ichthyosaurus; an ichthyosaur.

noun. An extinct genus of marine reptiles; -- so named from their short, biconcave vertebræ, resembling those of fishes. Several species, varying in length from ten to thirty feet, are known from the Liassic, Oölitic, and Cretaceous formations.

noun. Any of various extinct fishlike marine reptiles of the order Ichthyosauria of the Triassic period to the Cretaceous Period.

noun. ichthyosaurs of the Jurassic

"The animal to which the name ichthyosaurus has been given, was as long as a young whale, and it was fitted for living in the water, though breathing the atmosphere."

ichthyosaur  

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ichthyosaur  

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