from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of various amphibious dinosaurs of the genus Anatosaurus and related genera that had webbed feet and a ducklike bill. Also called duckbill, duck-billed dinosaur.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any ornithopod dinosaur of the family Hadrosauridae.
from the GNU version of the Collaborative International Dictionary of English
- n. Any member of the genus Hadrosaurus or family Hadrosauridae, an extinct family of heavy bipedal partly aquatic dinosaurs with duck-billed skull and webbed feet; of the Upper Cretaceous in North America.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. any of numerous large bipedal ornithischian dinosaurs having a horny duck-like bill and webbed feet; may have been partly aquatic
New Latin Hadrosaurus, genus name : Greek hadros, thick; see hadron + sauros, lizard.(American Heritage® Dictionary of the English Language, Fourth Edition)
Back-formation from Hadrosauridae, from the type genus Hadrosaurus, which in turn was derived from Ancient Greek ἁδρός (hadros, "strong") + σάυρα (saura, "lizard"). (Wiktionary)