plesiosaur

noun ple·si·o·saur \ ˈplē-sē-ə-ˌsȯr , -zē- \

Definition of plesiosaur

:any of an order or suborder (Plesiosauria) of large carnivorous marine reptiles of the Mesozoic with dorsoventrally flattened bodies and limbs modified into flippers

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Origin and Etymology of plesiosaur

ultimately from Greek plēsios close (akin to Greek pelas near) + sauros lizard


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