Any of numerous large bipedal ornithischian dinosaurs having a horny duck-like bill and webbed feet

• May have been partly aquatic

WordNet Word definitions in WordNet
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 ]

Wikipedia Word definitions in Wikipedia
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 ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
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.