Definitions for hadrosaurus
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Princeton's WordNet
hadrosaur, hadrosaurus, duck-billed dinosaur(noun)
any of numerous large bipedal ornithischian dinosaurs having a horny duck-like bill and webbed feet; may have been partly aquatic
Webster Dictionary
Hadrosaurus(noun)
an American herbivorous dinosaur of great size, allied to the iguanodon. It is found in the Cretaceous formation
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"hadrosaurus." Definitions.net. STANDS4 LLC, 2013. Web. 24 May 2013. <http://www.definitions.net/definition/hadrosaurus>.