Any of a family (Hadrosauridae) of large, duck-billed ornithopod dinosaurs of the Cretaceous Period.
Any of various medium-sized to large dinosaurs of the group Hadrosauroidea of the Cretaceous Period. Hadrosaurs had a duck-like bill and a mouth containing many series of rough grinding teeth for chewing tough plants. They walked on two legs or on all fours and had hoofed feet. Many hadrosaurs bore hollow crests on their skulls. They were the last and largest ornithopod dinosaurs.
Origin of hadrosaur
- From New Latin Hadrosaurus genus name hadrosaurus
From American Heritage Dictionary of the English Language, 5th Edition