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Noun
Geology . the portion of the earth, about 1800 mi. (2900 km) thick, between the crust and the core. Compare core 1 ( def. 10 ) , crust ( def. 6 ) .
Zoology . a single or paired outgrowth of the body wall that lines the inner surface of the valves of the shell in mollusks and brachiopods.
a chemically prepared, incombustible network hood for a gas jet, kerosene wick, etc., that, when the jet or wick is lighted, becomes incandescent and gives off a brilliant light.
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