/piks/ , n.
1. Eccles.
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 .
[ 1350-1400; ME pyxe pyxis pyxís a box, orig. made of boxwood ]