Definition of pyxes:
(n) :
(Roman Catholicism, also figurative) A small, usually round container used to hold the host (“consecrated bread or wafer of the Eucharist”), especially when bringing communion to the sick or others unable to attend Mass.
(n) :
(chiefly British) A box used in a mint as a place to deposit sample coins intended to have the fineness of their metal and their weight tested before the coins are issued to the public.
(v) :
(chiefly British) To deposit (sample coins) in a pyx; (by extension) to test (such coins) for the fineness of metal and weight before a mint issues them to the public.
(v) :
(figuratively) To enclose (something) in a box or other container; specifically, to place (a deceased person's body) in a coffin; to coffin, to encoffin.
(n) :
(by extension, rare) A (small) box; a casket, a coffret.
(n) :
(nautical, obsolete, rare) A compass used by sailors.