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.