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tourmaline Hear it!

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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