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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 O·nyx n.
 1. Min. Chalcedony in parallel layers of different shades of color.  It is used for making cameos, the figure being cut in one layer with the next as a ground.
 Onyx marble, Mexican onyx, a banded variety of marble or calcium carbonate resembling onyx.  It is obtained from Mexico in various colors ranging from white to deep black.
 

From: WordNet (r) 2.0

 Mexican onyx
      n : a hard compact kind of calcite [syn: alabaster, oriental
          alabaster, onyx marble]