Source : Webster's Revised Unabridged Dictionary (1913)

Pyx \Pyx\, n. [L. pyxis a box, Gr. pyxi`s a box, especially of
   boxwood, fr. py`xos the box tree or boxwood. See {Box} a
   receptacle.] [Written also {pix}.]
   1. (R. C. Ch.) The box, case, vase, or tabernacle, in which
      the host is reserved.

   2. A box used in the British mint as a place of deposit for
      certain sample coins taken for a trial of the weight and
      fineness of metal before it is sent from the mint.
      --Mushet.

   3. (Naut.) The box in which the compass is suspended; the
      binnacle. --Weale.

   4. (Anat.) Same as {Pyxis}.

   {Pyx cloth} (R. C. Ch.), a veil of silk or lace covering the
      pyx.

   {Trial of the pyx}, the annual testing, in the English mint,
      of the standard of gold and silver coins. --Encyc. Brit.

Pyx \Pyx\, v. t.
   To test as to weight and fineness, as the coins deposited in
   the pyx. [Eng.] --Mushet.

Source : WordNet®

pyx
     n 1: a chest in which coins from the mint are held to await assay
          [syn: {pix}, {pyx chest}, {pix chest}]
     2: any receptacle in which wafers for the Eucharist are kept
        [syn: {pix}]