| hadrosaurus | <paleontology> An American herbivorous dinosaur of great size, allied to the iguanodon. It is found in the Cretaceous formation. Origin: NL, fr. Gr. "adros thick + say^ros lizard. Source: Websters Dictionary (01 Mar 1998) |
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| hadrosaurus | any of numerous large bipedal ornithischian dinosaurs having a horny duck-like bill and webbed feet |
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