n. pictures; photographs. : Hold still and let me get your pix taken. Then you can jump around.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
pyx
c.1400, "a box," esp. the vessel in which the host or consecrated bread is preserved, from L. pyxis, from Gk. pyxis "box," from pyxos "box-tree," of uncertain origin.