| plesiosaurus 
 
 extinct marine reptile with a small head on a long neck a short tail and four paddle-shaped limbs;
 of the Jurassic and Cretaceous
 • Syn:
 plesiosaur
 • Hypernyms:
 archosaur, archosaurian, archosaurian reptile
 • Member Holonyms:
 genus Plesiosaurus
 
 
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