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n. An American herbivorous dinosaur of great size, allied to the iguanodon. It is found in the Cretaceous formation.

n. A genus of dinosaurian reptiles, typical of the family Hadrosauridæ. The original species of these gigantic iguanodons was H. foulki, from Haddonfield in New Jersey.

n. any of numerous large bipedal ornithischian dinosaurs having a horny duck-like bill and webbed feet; may have been partly aquatic

"But they're not as studied as much as the predatory dinosaurs, such as t-rex, which was the contemporary of the hadrosaurus."

ornithischian dinosaur    ornithischian   

edmontosaurus    trachodont    corythosaurus    anatotitan    trachodon    corythosaur