plesiosaurus definition

  • noun:
    • A genus of huge extinct marine reptiles, having a rather long-neck, a small head, and paddles for cycling. It lived in the Mesozoic age.
    • A genus of Reptilia, typical associated with the order Plesiosauria, and formerly conterminous with-it, today restricted to types from Upper Triassic (Rhætic) additionally the Liassic, as P. dolichodirus, with excessively long neck.
    • extinct marine reptile with a tiny head-on an extended neck a brief tail and four paddle-shaped limbs; for the Jurassic and Cretaceous

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