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pyrolusite definition

pyro·lu·site (pī′rō lo̵̅o̅′sīt′, pī räl′yo̵̅o̅-)

noun

a very soft, black, tetragonal mineral, MnO, an ore of manganese used in making glass, paint, etc.; manganese dioxide

Etymology: Ger pyrolusit < Gr pyr, fire + lousis, a washing (< louein, to wash < IE base *lou-, to wash > lather) + Ger -it, -ite: used, when heated, to remove color from glass

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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