Noun plesiosaurus has 1 sense
  1. plesiosaur, plesiosaurus - extinct marine reptile with a small head on a long neck a short tail and four paddle-shaped limbs; of the Jurassic and Cretaceous
    --1 is a kind of archosaur, archosaurian, archosaurian reptile
    --1 is a member of genus Plesiosaurus
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