plesiosaurus

noun
ple·si·o·sau·rus

Definition of plesiosaurus 

1 capitalized : a genus of marine reptiles (suborder Plesiosauria) of the Mesozoic of Europe and North America having a very long neck, a small head, and all four limbs developed as paddles for swimming

2 plural plesiosauri\-ȯˌrī\ : any reptile of the genus Plesiosaurus

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History and Etymology for plesiosaurus

New Latin, from plesi- + -saurus

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