2 definitions found From The Collaborative International Dictionary of English v.0.48 [gcide]: Greisen \Grei"sen\, n. (Min.) A crystalline rock consisting of quarts and mica, common in the tin regions of Cornwall and Saxony. [1913 Webster] From WordNet (r) 2.0 [wn]: greisen n : a granitic rock composed of quartz and mica
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