(ˈ)sär|däniks, (ˈ)sȧ|d-, -nēks sometimes ˈsärd ə niks or ˈsȧd- noun
( -es )
Etymology: Middle English sardonix, from Latin sardonyx, from Greek, probably from sardion sard + onyx onyx, nail — more at sard , nail
: an onyx marked by parallel layers of sard and of mineral of another color