opal Hear it!

opal definition

opal (ō′pəl)

noun

an amorphous, iridescent mineral, SiO·n HO, of various colors, often used as a gem; hydrous silicon oxide

Etymology: L opalus < Gr opallios < Sans úpalaḥ, (precious) stone

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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