'hadrosaur' definitions:

Definition of 'hadrosaur'

From: WordNet
noun
Any of numerous large bipedal ornithischian dinosaurs having a horny duck-like bill and webbed feet; may have been partly aquatic [syn: hadrosaur, hadrosaurus, duck-billed dinosaur]

Definition of 'hadrosaur'

From: GCIDE
  • hadrosaur \hadrosaur\ n. Any member of the genus Hadrosaurus or family Hadrosauridae, an extinct family of heavy bipedal partly aquatic dinosaurs with duck-billed skull and webbed feet; of the Upper Cretaceous in North America.
  • Syn: hadrosaurus. [WordNet 1.5]