wacky

<geology> A soft, earthy, dark-coloured rock or clay derived from the alteration of basalt.

Origin: G. Wacke, MHG.wacke a large stone, OHG. Waggo a pebble.

Source: Websters Dictionary

(01 Mar 1998)


Terms mentioned in text: geology, earthy, rock, clay, alteration, basalt
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