greisen Hear it!

greisen definition

grei·sen (grī′zən)

noun

a crystalline, igneous rock consisting mainly of quartz and white mica

Etymology: Ger, var. of greiss < dial. greissen, to split

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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