Standard Lemma guide

pachycephalosaur

noun · 2 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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1

noun

Meaning 1

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

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

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

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: pachycephalosaurus

Antonyms: none provided

Broader terms: bone-headed dinosaur

History

Etymology

Etymology tree Proto-Indo-European *bhenǵh- Proto-Indo-European *-us Proto-Indo-European *bhénǵhus Proto-Hellenic *pəkhús Ancient Greek παχύς (pakhús) Proto-Indo-European *ghebh- Proto-Indo-European *-ōl ? Proto-Indo-European *ghébhōlder. Proto-Hellenic *khephəlā́ Ancient Greek κεφαλή (kephalḗ) Pre-Greekbor. Ancient Greek σαύρα (saúra) Ancient Greek σαῦρος (saûros)bor. Translingual -saurus Translingual Pachycephalosauruslbor. English pachycephalosaur From the genus name translingual Pachycephalosaurus, equivalent to pachy- (“thick”) + cephalo- (“head”) + -saur (“lizard”).

Across languages

Translations

3 source translations are retained for this English entry.

  • Finnish: paksupää — dinosaur of the genus Pachycephalosaurus
  • Greek: παχυκεφαλόσαυρος (pachykefalósavros) — dinosaur of the genus Pachycephalosaurus
  • Portuguese: paquicefalossauro — dinosaur of the genus Pachycephalosaurus