Definition of elasmosaur in English:



  • A Cretaceous plesiosaur with a long neck shaped like that of a swan.

    Family Elasmosauridae, infraorder Plesiosauria: several genera, including Elasmosaurus

    • ‘The remains include the bones of dinosaurs, birds, and large marine reptiles such as mosasaurs and elasmosaurs, as well as fossilized sponges, mollusks, pine cones, and diverse fish teeth.’
    • ‘Like the rest of the Plesiosauroidea, elasmosaurs had a barrel-shaped body with four paddle-shaped flippers.’
    • ‘Storrs considers this species a synonym of P. guilelmiimperatoris, while Robert Bakker asserts that it is an early elasmosaur, and transfers it to the genus Microcleidus (as M. brachypterygius).’
    • ‘Elasmosaurus was the longest member of the elasmosaur family and in fact, the longest-known plesiosaur.’
    • ‘However, all elasmosaurs are quite similar, and extreme, in overall body morphology.’


Late 19th century from modern Latin Elasmosaurus, from Greek elasmos ‘beaten metal’ + sauros ‘lizard’.