pyx
Concise Oxford English Dictionary © 2008 Oxford University Press:
pyx /pɪks/ (also pix)
▶noun
- 1 Christian Church the container 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.
– origin ME: from L. pyxis, from Gk puxis ‘box’.
'pyx' also found in these Oxford entries:

