wacke

[ wak-uh ]
/ ˈwæk ə /

noun

a poorly sorted sandstone containing fragments of rock and minerals in a clayey matrix.
Compare graywacke.

Origin of wacke

1795–1805; < German: a kind of stone
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for wacke

wacke

/ (ˈwækə) /

noun

obsolete any of various soft earthy rocks that resemble or are derived from basaltic rocks

Word Origin for wacke

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