Had·ro·sau·rus n. Paleon. An American herbivorous dinosaur of great size, allied to the iguanodon. It is found in the Cretaceous formation.
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hadrosaurus
n : any of numerous large bipedal ornithischian dinosaurs having
a horny duck-like bill and webbed feet; may have been
partly aquatic [syn: hadrosaur, duck-billed dinosaur]