from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A greyish variety of trachyte.

from the GNU version of the Collaborative International Dictionary of English

  • n. A grayish variety of trachyte; -- so called from the Puy-de-Dôme in Auvergne, France, where it is found.

from The Century Dictionary and Cyclopedia

  • n. A variety of trachyte occurring in the volcanic region of central France.


From Puy-de-Dôme, where it is found, +‎ -ite. (Wiktionary)



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