{i} type of onyx having alternating orange-brown sard and white chalcedony arranged in straight aligned bands (was used very much in the past in making cameos)
sardonyx
الواصلة
sar·don·yx
النطق
علم أصول الكلمات
[ sär-'dä-niks also ] (noun.) 14th century. Middle English sardonix, from Latin sardonyx, from Greek.