Definition of hadrosaur
:any of a genus (Hadrosaurus) or family (Hadrosauridae) of mainly bipedal dinosaurs of the Late Cretaceous that have the forward part of the jaws toothless and flattened into a beak-like snout and the back part of the jaws filled with rows of numerous small, grinding teeth and that often have a solid or hollow bony crest on the skull :duck-billed dinosaur
- … the hadrosaurs evolved into some 21 different species during their 20 million-year stint on earth …
- —Virginia Morell
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