Definition of "ichthyosaurus" [‖Ich•thy•o•sau•rus]

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

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• "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."
• "These diagrams of the plesiosaurus, the ichthyosaurus, the pterodactyle, give you a notion of some of these extinct reptiles."
• "And here is a cast of the pterodactyle and bones of the ichthyosaurus and the plesiosaurus, just as fresh as if it had been recently dug up in a churchyard."