1. plural of elasmosaur; large marine reptiles from the Mesozoic era with long necks, four flippers, and a small head
Usage: paleontology; plural form

Examples

• Elasmosaurs were among the most successful marine predators of the Cretaceous period.
• The fossil record shows that elasmosaurs had extremely long necks that made up much of their body length.
• Scientists believe elasmosaurs hunted fish and other small marine animals.
• Many elasmosaurs were discovered in the Western Interior Seaway of North America.
• The long neck of elasmosaurs allowed them to reach prey in different water depths.