[sahr-don-iks, sahr-dn-]
a chalcedony that is used for cameos and has sard and chalcedony of another color, usually white, arranged in straight parallel bands.

1300–50; Middle English < Latin < Greek sardónyx; see sard, onyx Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sardonyx (ˈsɑːdənɪks)
a variety of chalcedony with alternating reddish-brown and white parallel bands, used as a gemstone. Formula: SiO2
[C14: via Latin from Greek sardonux, perhaps from sardionsardine² + onux nail]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Bible Dictionary

Sardonyx definition

(Rev. 21:20), a species of the carnelian combining the sard and the onyx, having three layers of opaque spots or stripes on a transparent red basis. Like the sardine, it is a variety of the chalcedony.

Easton's 1897 Bible Dictionary
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Example sentences
Sardonyx is a form of onyx with layers of reddish-brown and white banding.
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