MEERSCHAUM, n. A fine white clay, which for convenience in coloring it brown is made into tobacco pipes and smoked by the workmen engaged in that industry.
Source: The Devil's Dictionary, 1911.
-- Ambrose Bierce, (Jun 24 1842-1914), US journalist, short-story writer; He was a noted wit, satirist and sardonic short story writer who disappeared while covering the Mexican revolution.