| Noun | 1. | Hadrosauridae - duck-billed dinosaurs; upper Cretaceous reptile family - a family of reptiles euronithopod, Euronithopoda, Ornithopoda, suborder Euronithopoda, suborder Ornithopoda - widespread group including duck-billed dinosaurs and their early relatives (hadrosaurs, trachodon and iguanodon) 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 Anatotitan - genus of large duck-billed dinosaurs; late Cretaceous genus Corythosaurus - genus of duck-billed dinosaurs of late Cretaceous genus Edmontosaurus - duck-billed dinosaurs of Canada |