1. a large marine reptile of the Cretaceous period with a long neck, four flippers, and a small head
Usage: paleontology; often capitalized when referring to the genus Elasmosaurus

Examples

• The elasmosaurus was one of the longest marine reptiles ever discovered.
• Fossils of elasmosaurus have been found in North American rock formations.
• The elasmosaurus used its long neck to hunt fish in ancient seas.
• Scientists believe the elasmosaurus could grow up to 46 feet in length.
• The distinctive long neck of the elasmosaurus made it instantly recognizable among prehistoric creatures.