Plesiosauria
plural noun
Ple·si·o·sau·ria
| \ ˌplēsēəˈsȯrēə \
Definition of Plesiosauria
1
: a suborder of Sauropterygia comprising Mesozoic marine reptiles with dorsoventrally flattened bodies and limbs modified into paddles — compare plesiosaurus
2
in some classifications
: an order of Reptilia nearly coextensive with Sauropterygia
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Merriam-Webster unabridged
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