- hadrosaur, hadrosaurus, duck-billed dinosaur - any of numerous large bipedal ornithischian dinosaurs having a horny duck-like bill and webbed feet; may have been partly aquatic
--1 is a kind of ornithischian, ornithischian dinosaur
--1 is a member of Hadrosauridae, family Hadrosauridae
--1 has particulars:anatotitan; corythosaur, corythosaurus; edmontosaurus; trachodon, trachodont