[ grahy-zuh n ]
/ ˈgraɪ zən /


a hydrothermally altered rock of granitic texture composed chiefly of quartz and mica, common in the tin mines of Europe.

Origin of greisen

Borrowed into English from German around 1875–80 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for greisen

British Dictionary definitions for greisen

/ (ˈɡraɪzən) /


a light-coloured metamorphic rock consisting mainly of quartz, white mica, and topaz formed by the pneumatolysis of granite

Word Origin for greisen

C19: from German, from greissen to split
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012