sardonyx Hear it!

sardonyx definition

sar·donyx (sär däniks, särdə niks)

noun

a variety of onyx made up of alternating layers of white chalcedony and sard, used as a gem, esp. in making cameos

Etymology: ME < L < Gr sardonyx < sardios, sard + onyx, onyx

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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