1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Wacke  \Wack"e\,  Wacky  \Wack"y\,  n.  [G.  wacke,  MHG.  wacke  a  large 
  stone,  OHG.  waggo  a  pebble.]  (Geol.) 
  A  soft,  earthy,  dark-colored  rock  or  clay  derived  from  the 
  alteration  of  basalt. 

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