Definitions:

1. A genus of duck-billed dinosaurs that lived during the late Cretaceous period approximately 79 to 73 million years ago. NOUN
   • Scientists believe Hadrosaurus primarily fed on low-lying vegetation due to its duck-billed snout.
2. An American herbivorous dinosaur of great size, allied to the iguanodon. NOUN
   • The Hadrosaurus large size made them vulnerable to attack by formidable predators such as Tyrannosaurus Rex.
3. Any of numerous bipedal dinosaurs having a horny-like bill and webbed feet, also known as bulky lizard. NOUN
   • The discovery of Hadrosaurus marked a significant milestone in the stydy of dinosaurs.

Synonyms:

• duck-billed dinosaur
• hadrosaur
• hadrosaurid