pyx
noun
ˈpiks 
1
: a container for the reserved host
especially : a small round metal receptacle used to carry the Eucharist to the sick
2
: a box used in a mint for deposit of sample coins reserved for testing weight and fineness
Word History
Etymology
Middle English, from Medieval Latin pyxis, from Latin, box, from Greek, from pyxos box (shrub)
First Known Use
15th century, in the meaning defined at sense 1