a variety of onyx made up of alternating layers of white chalcedony and sard, used as a gem, esp. in making cameos
Origin of sardonyxMiddle English from Classical Latin from Classical Greek sardonyx from sardios, sard + onyx, onyx
An onyx with alternating brown and white bands of sard and other minerals.
Origin of sardonyxMiddle English sardonix probably from Latin sardonyx from Greek sardonux sardion sard ; see sard . onux onyx, nail ; see nogh- in Indo-European roots.