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|Noun||1.||corythosaur - duck-billed dinosaur with nasal passages that expand into a crest like a hollow helmet|
duck-billed dinosaur, hadrosaur, hadrosaurus - any of numerous large bipedal ornithischian dinosaurs having a horny duck-like bill and webbed feet; may have been partly aquatic
genus Corythosaurus - genus of duck-billed dinosaurs of late Cretaceous