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wacke

[wak-uh] /ˈwæk ə/
noun
1.
a poorly sorted sandstone containing fragments of rock and minerals in a clayey matrix.
Compare graywacke.
Origin
1795-1805
1795-1805; < German: a kind of stone
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for wacke

wacke

/ˈwækə/
noun
1.
(obsolete) any of various soft earthy rocks that resemble or are derived from basaltic rocks
Word Origin
C18: from German: rock, gravel, basalt
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
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Word Origin and History for wacke
n.

rock resembling sandstone, 1803, from German Wacke, from Middle High German wacke "a large stone," from Old High German wacko "gravel," probably from Old High German wegan "to move." A miner's word, brought into geology by German geologist Abraham Gottlob Werner (1750-1817).

Online Etymology Dictionary, © 2010 Douglas Harper
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14
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