plesiosaurus

Definitions of plesiosaurus
  1. noun
    extinct marine reptile with a small head on a long neck a short tail and four paddle-shaped limbs; of the Jurassic and Cretaceous
    synonyms: plesiosaur
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    type of:
    archosaur, archosaurian, archosaurian reptile
    extinct reptiles including: dinosaurs; plesiosaurs; pterosaurs; ichthyosaurs; thecodonts
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