sardonyx

[ sahr-don-iks, sahr-dn- ]
/ sɑrˈdɒn ɪks, ˈsɑr dn- /
|

noun

a chalcedony that is used for cameos and has sard and chalcedony of another color, usually white, arranged in straight parallel bands.

Origin of sardonyx

1300–50; Middle English < Latin < Greek sardónyx; see sard, onyx
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British Dictionary definitions for sardonyx

sardonyx

/ (ˈsɑːdənɪks) /

noun

a variety of chalcedony with alternating reddish-brown and white parallel bands, used as a gemstone. Formula: SiO 2

Word Origin for sardonyx

C14: via Latin from Greek sardonux, perhaps from sardion sardine ² + onux nail
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012