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Webster's 1913 Dictionary

PLESIOSAURIA

Ple `si *o *sau "ri *a, n. pl. Etym: [NL. See Plesiosaurus. ] (Paleon.)

 

Defn: An extinct order of Mesozoic marine reptiles including the genera Plesiosaurus, and allied forms; -- called also Sauropterygia.

 

PLESIOSAURIAN

PLESIOSAURIAN Ple `si *o *sau "ri *an, n. (Paleon.)

 

Defn: A plesiosaur.