ichthyosaurus(noun)

ichthyosaurs of the Jurassic

ichthyosaurus(Noun)

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

Ichthyosaurus(noun)

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

Ichthyosaurus

an extinct marine reptile in the shape of a fish, its limbs paddles, and with a long lizard-like tail.