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elasmosaur Syllabification: e·las·mo·saur
Pronunciation: /əˈlazməˌsôr/
(also elasmosaurusəˌlazməˈsôrəs)

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
Example sentences
  • 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).


Example sentences
  • Several associated series of elasmosaurian cervical vertebrae were used to measure ranges of potential flexion.
  • The cervical vertebrae are very short, suggesting pliosaurian relationships, whereas the scapulae and coracoids seem to be elasmosaurian.


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

Definition of elasmosaur in:
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