The Collaborative International Dictionary
Wacke
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.
Douglas Harper's Etymology Dictionary
wacke
rock resembling sandstone, 1803, from German Wacke, from Middle High German wacke "large stone, rock projecting from the surface of the ground," from Old High German wacko, waggo "gravel, pebble," probably from Old High German wegan "to move." A miner's word, brought into geology by German geologist Abraham Gottlob Werner (1750-1817).
Wiktionary
wacke
n. (context geology English) A soft, earthy, dark-coloured rock or clay derived from the alteration of basalt.
Usage examples of "wacke".
She always had to empty her bag to get to her keys which sunk like wacke to the cluttered depths.