From The Collaborative International Dictionary of English v.0.48:

Onycha \On"y*cha\, n. [NL., from L. onyx, -ychis, onyx, also, a
   kind of mussel, Gr. ?, ?. See Onyx.]
   [1913 Webster]
   1. An ingredient of the Mosaic incense, probably the
      operculum of some kind of strombus. --Ex. xxx. 34.
      [1913 Webster]

   2. The precious stone called onyx. [R.]
      [1913 Webster]
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