Definition of elasmosaur in English:

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Pronunciation: /əˈlazməˌsôr/
(also elasmosaurus /əˌlazməˈsôrəs/)


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'.

For editors and proofreaders

Syllabification: e·las·mo·saur

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