Any of various herbivorous ornithischian dinosaurs of the family Hadrosauridae of the Cretaceous Period, having a broad toothless beak, numerous teeth in the back of the jaw, a stiff tail, and sometimes a crest on the head. Also called duckbill . Also called duck-billed dinosaur . Also called hadrosaur .
Origin of hadrosauridFrom New Latin Hadrosauridae family name from Hadrosaurus type genus ; see hadrosaurus .