plesiosaur
noun
ple·si·o·saur
ˈplē-sē-ə-ˌsȯr
-zē-
: 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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Merriam-Webster unabridged
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