Pachycephalosaur

noun

noun ·Rare ·Advanced level

Definitions

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

    "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."

  2. 2
    bipedal herbivore having 10 inches of bone atop its head; largest boneheaded dinosaur ever found wordnet

Synonyms

All synonyms
pachycephalosaurus

Example

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"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."

Etymology

Etymology tree Proto-Hellenic *pəkʰús Ancient Greek παχύς (pakhús) Proto-Hellenic *kʰepʰəlā́ Ancient Greek κεφαλή (kephalḗ) 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”).

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