PIX
pyx, pix
(noun) any receptacle in which wafers for the Eucharist are kept
pyx, pix, pyx chest, pix chest
(noun) a chest in which coins from the mint are held to await assay
Source: WordNet® 3.1
Etymology 1
Noun
pix pl (plural only)
(informal) Plural form of pic in the sense of "picture".
Specifically, motion pictures; movies.
Etymology 2
Noun
pix (plural pixes)
Alternative form of pyx
Source: Wiktionary
Pix, n. & v.
Definition: See Pyx.
PIC
Pic, n. Etym: [Cf. F. pic.]
Definition: A Turkish cloth measure, varying from 18 to 28 inches.
Source: Webster’s Unabridged Dictionary 1913 Edition