Sardonyx definitions

sär-dŏn'ĭks, sär'dn-ĭks'
An onyx with alternating brown and white bands of sard and other minerals.
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A variety of onyx made up of alternating layers of white chalcedony and sard, used as a gem, esp. in making cameos.
noun
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A gemstone having bands of red sard; a variety of onyx or chalcedony.
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Origin of sardonyx

Middle English sardonix probably from Latin sardonyx from Greek sardonux sardion sard sard onux onyx, nail nogh- in Indo-European roots