Pronunciation: (piks), [key]
a. the box or vessel in which the reserved Eucharist or Host is kept.
b. a watch-shaped container for carrying the Eucharist to the sick.
2. Also called pyx' chest". a box or chest at a mint, in which specimen coins are deposited and reserved for trial by weight and assay. Also,pix.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.