Wacke

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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.
     [1913 Webster]