n. (also pix) 1 Eccl. the vessel in which the consecrated bread of the Eucharist is kept. 2 (in the UK) a box at the Royal Mint in which specimen gold and silver coins are deposited to be tested annually.
[ ME f. L (as PYXIS) ]
PYX
Meaning of PYX in English
Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012