from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A light-colored volcanic rock composed largely of feldspars.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a light-coloured rock of volcanic origin composed mostly of alkali feldspars
from the GNU version of the Collaborative International Dictionary of English
- n. A compact, feldspathic, igneous rock containing nephelite, haüynite, etc. Thin slabs give a ringing sound when struck; -- called also clinkstone.
from The Century Dictionary and Cyclopedia
- n. The name given by Klaproth to certain volcanic rocks of exceedingly variable and complex character, but closely related to the trachytes.
Sorry, no etymologies found.