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wacke |
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.