| Hadrosaurus | ‖n. [ NL., fr. Gr. |
| hadrosaur | n. Any member of the genus |
| Hadrosauridae | prop. n. A natural family of extinct reptiles including the duck-billed dinosaurs. |
| hadrosaur | (n) any of numerous large bipedal ornithischian dinosaurs having a horny duck-like bill and webbed feet; may have been partly aquatic, Syn. hadrosaurus, duck-billed dinosaur |
| hadrosauridae | (n) duck-billed dinosaurs; upper Cretaceous, Syn. family Hadrosauridae |