Webster's English Dictionary

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pyx

pyx \'piks\ n [ME, fr. ML pyxis, fr. L, box, fr. Gk - more at BOX] 1: a 
   container for the reserved Host; esp : a usu. watch-shaped cas e used to 
   carry the Eucharist to the sick 2: a box used in a mint for deposit of 
   sample coins reserved for testing we ight and fineness