1. any of numerous large bipedal ornithischian dinosaurs having a horny duck-like bill and webbed feet; may have been partly aquatic; [syn: hadrosaur, hadrosaurus, duck-billed dinosaur]
WordNet (r) 3.0 (2006):
duck-billed dinosaur
n 1: any of numerous large bipedal ornithischian dinosaurs
having a horny duck-like bill and webbed feet; may have
been partly aquatic [syn: hadrosaur, hadrosaurus,
duck-billed dinosaur]