Definitions

1. noun

A type of long-necked, carnivorous plesiosaur that lived during the Cretaceous period.

“The elasmosaur was a large marine reptile that dominated the oceans during its time.”

2. noun

A genus of plesiosaurs, typically characterized by its long neck and short tail.

“The fossil discovery of the elasmosaur has greatly advanced our understanding of ancient marine life.”