sardonyx

sar·don·yx

S0090700 (sär-dŏn′ĭks, sär′dn-ĭks′)n. An onyx with alternating brown and white bands of sard and other minerals.

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[Middle English sardonix, probably from Latin sardonyx, from Greek sardonux : sardion, sard; see sard + onux, onyx, nail; see nogh- in Indo-European roots.]

sardonyx

(ˈsɑːdənɪks) n (Minerals) a variety of chalcedony with alternating reddish-brown and white parallel bands, used as a gemstone. Formula: SiO2[C14: via Latin from Greek sardonux, perhaps from sardion sardine² + onux nail]

sar•don•yx

(sɑrˈdɒn ɪks, ˈsɑr dn-)

n. an onyx composed of layers of sard and chalcedony of another color, usu. white: used as a gem and to make cameos. [1300–50; Middle English < Latin < Greek sardónyx; see sard, onyx]

Thesaurus

Noun

1.

sardonyx - an onyx characterized by parallel layers of sard and a different colored mineralonyx - a chalcedony with alternating black and white bands; used in making cameos