Hypertext Webster Gateway: "wacke"
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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