What is "hadrosaurus"

Hadrosaurus \Had`ro*sau"rus\ (h[a^]d`r[-o]*s[add]"r[u^]s), n. [NL., fr. Gr. "adro`s thick + say^ros lizard.] (Paleon.) An American herbivorous dinosaur of great size, allied to the iguanodon. It is found in the Cretaceous formation.

n. any of numerous large bipedal ornithischian dinosaurs having a horny duck-like bill and webbed feet; may have been partly aquatic [syn: hadrosaur, duck-billed dinosaur]

Hadrosaurus (; from Greek ἁδρός, hadros, meaning "bulky" or "large", and σαῦρος, sauros, meaning "lizard") is a valid genus of hadrosaurid dinosaur. The only known skeleton was discovered in 1858, representing the first dinosaur species known from more than isolated teeth to be identified in North America. In 1868, it became the first ever mounted dinosaur skeleton. Hadrosaurus foulkii is the only species in this genus and has been the official state dinosaur of New Jersey, United States since 1991.

H. foulkii is known from a single specimen consisting of much of the skeleton and parts of the skull. The specimen was collected from the Woodbury Formation in New Jersey, USA. Using radio-isotope dating of bivalve shells from the same formation, the sedimentary rocks where the Hadrosaurus fossil was found were formed at some time between 80.5 and 78.5 million years ago.