corundum Hear it!

corundum definition

co·run·dum (kə run′dəm)

noun

a very hard mineral, aluminum oxide, AlO: a dark, coarse variety (emery) is used for grinding and polishing; clear, transparent varieties (ruby, sapphire) are used as gems

Etymology: Tamil kurundam < Sans kuruvinda, ruby

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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