from The American Heritage® Dictionary of the English Language, 4th Edition
- n. See hadrosaur.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An informal name for ornithopod dinosaurs of the family Hadrosauridae derived from the similarity of the heads of certain members of that family to those of modern ducks.
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
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