| plesiosaur | (n) extinct marine reptile with a small head on a long neck a short tail and four paddle-shaped limbs; of the Jurassic and Cretaceous, Syn. plesiosaurus |
| plesiosauria | (n) any of the plesiosaurs, Syn. suborder Plesiosauria |
| Plesiosaur | n. (Paleon.) One of the Plesiosauria. [ 1913 Webster ] |
| Plesiosauria | ‖n. pl. [ NL. See Plesiosaurus. ] (Paleon.) An extinct order of Mesozoic marine reptiles including the genera Plesiosaurus, and allied forms; -- called also |
| Plesiosaurian | n. (Paleon.) A plesiosaur. [ 1913 Webster ] |
| Plesiosaurus | ‖n.; |
| プレシオザウルス | [pureshiozaurusu] (n) Plesiosaurus [Add to Longdo] |
| 首長竜 | [くびながりゅう, kubinagaryuu] (n) plesiosaur [Add to Longdo] |