Meanings
plural pachycephalosaurs
- Any of a group of herbivorous dinosaurs, of the genus Pachycephalosaurus from the late Cretaceous period.First known use 20th c.
One could almost call Triopticus a mimic were it not for the fact that it dates to 228-220 million years ago, meaning that it predates the pachycephalosaurs by over 100 million years.
2016 September 28, David Hone, “‘Three-eyed’ extinct reptile was a bone-headed dinosaur mimic 100 million years early”, in The Guardian
Synonyms & antonyms
nounbipedal herbivore having 10 inches of bone atop its head; largest boneheaded dinosaur ever found
Synonym sets from Open English WordNet, CC BY 4.0.
Origin
- Proto-Indo-European*bʰenǵʰ-
- Proto-Indo-European*bʰénǵʰus
- Proto-Hellenic*pəkʰús
- Ancient Greekπαχύς (pakhús)
- Proto-Indo-European*gʰebʰ-
- Proto-Indo-European*gʰébʰōl
- Proto-Hellenic*kʰepʰəlā́
- Ancient Greekκεφαλή (kephalḗ)
- Ancient Greekσαύρα (saúra)
- Ancient Greekσαῦρος (saûros)
- Englishpachycephalosaur
From the genus name translingual Pachycephalosaurus, equivalent to pachy- (“thick”) + cephalo- (“head”) + -saur (“lizard”).
More words from translingual
Full word history & related roots →Translations
Finnish paksupää
- paksupäädinosaur of the genus Pachycephalosaurus
Greek παχυκεφαλόσαυρος
- παχυκεφαλόσαυρος (pachykefalósavros)dinosaur of the genus Pachycephalosaurus
Portuguese paquicefalossauro
- paquicefalossaurodinosaur of the genus Pachycephalosaurus
Cite this entry
pachycephalosaur. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/pachycephalosaur
“pachycephalosaur.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/pachycephalosaur. Accessed November 4, 2026.
WatkinsX Dictionary, s.v. “pachycephalosaur,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/pachycephalosaur.
Source: pachycephalosaur on Wiktionary, CC BY-SA 4.0.