plesiosaurus
noun
ple·si·o·sau·rus
ˌplēsēəˈsȯrəs
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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Merriam-Webster unabridged
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