sardonyx

noun
sar·don·yx | \sär-ˈdä-niks also ˈsär-də-niks \

Definition of sardonyx 

: an onyx having parallel layers of sard

First Known Use of sardonyx

14th century, in the meaning defined above

History and Etymology for sardonyx

Middle English sardonix, from Latin sardonyx, from Greek

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The first known use of sardonyx was in the 14th century

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