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pachycephalosaur Syllabification: pach·y·ceph·a·lo·saur
Pronunciation: /ˌpakiˈsefələsôr/

Definition of pachycephalosaur in English:


A bipedal herbivorous dinosaur of the late Cretaceous period with a thick domed skull.
Example sentences
  • An alternate view, that ceratopsians and pachycephalosaurs diverged from ornithopod dinosaurs in the Late Jurassic, is more consistent with the preserved biostratigraphic evidence.
  • The domed skulls of pachycephalosaurs may likewise have been vibrantly colored to indicate sexual maturity, attract a mate, or warn an adversary.
  • Marginocephalia consists mainly of the pachycephalosaurs (bone-heads) and the ceratopsians (horned dinosaurs), like Triceratops.


From Greek pakhus 'thick' + kephalē 'head' + sauros 'lizard'.

Definition of pachycephalosaur in:

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