Definition of hadrosaur in English:

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Pronunciation: /ˈhadrəˌsôr/
(also hadrosaurus /ˌhadrəˈsôrəs/)


A large, herbivorous, mainly bipedal dinosaur of the middle to 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.



Example sentences
  • This particular accumulation of ceratopsian and hadrosaurian bones is thought to represent a mass mortality event: possibly a herd was concentrated around a drying watering hole during a severe drought in the area.
  • The hadrosaurian down-flex in the spinal column has been smoothed out.
  • However, comparison of the specimens with dinosaur skin shows that a similar integumentary morphology has previously been documented in hadrosaurian dinosaurs.


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

For editors and proofreaders

Syllabification: had·ro·saur

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