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hadrosaur Line breaks: had¦ro|saur
Pronunciation: /ˈhadrəsɔː/

Definition of hadrosaur in English:


A large herbivorous mainly bipedal dinosaur of the late Cretaceous period, with jaws flattened like the bill of a duck. Also called duck-billed dinosaur.
  • Family Hadrosauridae, infraorder Ornithopoda, order Ornithischia
Example sentences
  • There is a parallel here with the hadrosaur and ceratopsian dinosaurs of the Late Cretaceous.
  • The ornithopods included the hadrosaurs or duck-billed dinosaurs, in which the front of the mouth was enlarged to form a broad flat beak and a variety of bony crests were developed on top of the head.
  • The Ornithopoda included the hadrosaurs, the iguanodontids, the heterodontosaurs, the hypsilophodontids, and various other dinosaurs.


Late 19th century: from modern Latin Hadrosaurus (genus name), from Greek hadros 'thick, stout' + sauros 'lizard'.

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