elasmosaur
/ɪˈlæzməʊsɔː/noun
1- a Cretaceous plesiosaur with a long neck shaped like that of a swan板龙, 薄板龙（白垩纪的蛇颈龙）。
1.1
- Family Elasmosauridae, infraorder Plesiosauria: several genera, including Elasmosaurus.板龙科, 蛇颈龙下目：数属, 包括薄板龙属。
词源
late 19th cent.: from modern Latin Elasmosaurus, from Greek elasmos 'beaten metal' + sauros 'lizard'.