What does "pachycephalosaurus" mean?

Any of a group of herbivorous dinosaurs, of the genus Pachycephalosaurus from the late Cretaceous period.

What is a synonym for "pachycephalosaurus"?

Common synonyms include: pachycephalosaur, pachycephalosaur.

Pronounced //ˌpækɪˌsɛfələˈsɔːɹəs//.

//ˌpækɪˌsɛfələˈsɔːɹəs// noun

noun ·Rare ·Advanced level

Noun

1
Any of a group of herbivorous dinosaurs, of the genus Pachycephalosaurus from the late Cretaceous period.
2
bipedal herbivore having 10 inches of bone atop its head; largest boneheaded dinosaur ever found wordnet

Borrowed from translingual Pachycephalosaurus, from pachy- (“thick”) + cephalo- (“head”) + -saurus (“lizard”).

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.