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Search Result for "sardonyx": 
Wordnet 3.0

NOUN (1)

1. an onyx characterized by parallel layers of sard and a different colored mineral;

The Collaborative International Dictionary of English v.0.48:

Sardonyx \Sar"do*nyx\, n. [L., fr. Gr. ?. See Sard, and Onyx.] (Min.) A variety of onyx consisting of sard and white chalcedony in alternate layers. [1913 Webster]