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tourmaline
tourmaline definition
tour·ma·line (to̵or′mə lin, -lēn′)
noun
a very hard, piezoelectric, rhombohedral mineral, (Na,Ca)(Mg,Fe,Al,Li)Al(BO)(SiO)(OH), of various colors, used as a gem and in making pressure gauges
Etymology: Fr, ult. < Sinhalese tōramalli, carnelian
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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