early 14c., "free from spiritual pollution," from Old French purefier "purify, cleanse, refine" (12c.), from Latin purificare "to make pure," from purus "pure" (see pure) + combining form of facere "to make" (from PIE root *dhe- "to set, put"). Meaning "free from extraneous matter" is recorded from mid-15c. Related: Purified; purifying.
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