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Noun1.Ichthyosaurus - ichthyosaurs of the Jurassicichthyosaurus - ichthyosaurs of the Jurassic  
ichthyosaur - any of several marine reptiles of the Mesozoic having a body like a porpoise with dorsal and tail fins and paddle-shaped limbs
genus Ichthyosaurus - type genus of the Ichthyosauridae
References in classic literature ?
Indeed, I found afterwards that horses, cattle, sheep, dogs, had followed the Ichthyosaurus into extinction.
Tatterdemalion vagrants--cheap braggadocio--"Arabian mares" spined and necked like the ichthyosaurus in the museum, and humped and cornered like a dromedary
A dead- ened burst of mighty splashes and snorts reached us from afar, as though an ichthyosaurus had been taking a bath of glitter in the great river.
The animal, a primitive relative of the dolphinlike reptile Ichthyosaurus, may have paddled flexible flippers over sand and used its heavy bones to stand up to waves crashing on shore.
Many fossilised prehistoric animals have been found on the cliffs around Whitby including the 180-million-year-old Ichthyosaurus Crassimanus, which is seven metres long, found in the cliffs near Hawsker and displayed on the wall of Whitby Museum in Pannett Park.
Some of the more fascinating fossils consist of the head of a Triceratops which is around 68 million years old, the head of an Ichthyosaurus which is around 200 million years old and a complete nest of the Hadrosaur, which is around 144 to 165 million years old.