Definitions:

1. A genus of pachycephalosaurid dinosaurs known for their distinctive, thick, dome-shaped skulls. NOUN
   • The pachycephalosaurus' diet consisted primarily of plants, and its broad, beak-like jaws were adapted for grazing.
2. A large herbivorous dinosaur of the late Cretaceous Period, with a domed skull that was lined wit small bumps and spikes, which may have been used for head-butting during mating displays. NOUN
   • The pachycephalosaurus' skull could withstand powerful impacts, making it a formidable opponent.

Synonyms:

• pachycephalosaur