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Definition of pachycephalosaurus

pachycephalosaurus

/ˌpæk.ɪˌsɛf.ə.loʊˈsɔːr.əs/
pach · y · ceph · a · lo · sau · rus
Plural:pachycephalosauruses
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pachycephalosaurus Lexical Profile

• noun

1

A genus of large, bipedal, herbivorous or omnivorous dinosaur from the Late Cretaceous period of North America, characterized by an extremely thick, domed skull roof surrounded by bony knobs.

Synonyms
View all synonyms for pachycephalosaurus

• Rhymes for pachycephalosaurus

• Nearby Words

pacesetting
pachira
pachycare
pachycephalosaurus
pachyderm
pachygyria
pachysandra

Word Origin & Etymology

Coined in 1943 by paleontologist Charles W. Gilmore, derived from the Ancient Greek words 'pakhús' (thick), 'kephalḗ' (head), and 'saûros' (lizard), referring to the remarkably thick bone forming the roof of the dinosaur's skull.

Usage Trend

Historical frequency of usage in published text.

180019102020
Data source: Google Books Ngram Viewer

Cite this Entry

Wordmom. (2026). Definition of Pachycephalosaurus. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/pachycephalosaurus
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