elasmosaur

 
Pronunciation: /ɪˈlazmə(ʊ)sɔː/

noun

  • a Cretaceous plesiosaur with a long neck shaped like that of a swan.
    • Family Elasmosauridae, infraorder Plesiosauria: several genera, including Elasmosaurus

Origin:

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