pachycephalosaurus

/ˌpækɪˌsɛfələˈsɔːɹəs/

noun

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

Similar
pachycephalosaur
OriginAncient Greek σαῦρος (saûros) ← Proto-Hellenic *kʰepʰəlā́ ← Proto-Indo-European *gʰébʰōl →
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Meanings

nounpachycephalosaurus (plural pachycephalosauruses or pachycephalosauri)

plural pachycephalosauruses · plural pachycephalosauri

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

Synonyms & antonyms

nounbipedal herbivore having 10 inches of bone atop its head; largest boneheaded dinosaur ever found

Similar
pachycephalosaur
Broader
bone-headed dinosaur
Also see
pachycephalosaur

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

  1. Proto-Indo-European*bʰenǵʰ-
  2. Proto-Indo-European*bʰénǵʰus
  3. Proto-Hellenic*pəkʰús
  4. Ancient Greekπαχύς (pakhús)
  5. Proto-Indo-European*gʰébʰōl
  6. Proto-Hellenic*kʰepʰəlā́
  7. Ancient Greekκεφαλή (kephalḗ)
  8. Ancient Greekσαύρα (saúra)
  9. Ancient Greekσαῦρος (saûros)
  10. Englishpachycephalosaurus

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

More words from translingual

Full word history & related roots →
Cite this entry
APA

pachycephalosaurus. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/pachycephalosaurus

MLA

“pachycephalosaurus.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/pachycephalosaurus. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “pachycephalosaurus,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/pachycephalosaurus.

Source: pachycephalosaurus on Wiktionary, CC BY-SA 4.0.