A large pachycephalosaurian dinosaur of the genus Pachycephalosaurus, having a thick domed skull with bony knobs and a long tail. Also called pachycephalosaur.
[New Latin Pachycephalosaurus, genus name : Greek pakhus, thick + Greek kephalē, head; see ghebh-el- in the Appendix of Indo-European roots + Greek sauros, lizard.]
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Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.