Source : Webster's Revised Unabridged Dictionary (1913)

Purify \Pu"ri*fy\, v. t. [imp. & p. p. {Purified}; p. pr. & vb.
   n. {Purifying}.] [F. purifier, L. purificare; purus pure +
   -ficare (in comp.) to make. See {Pure}, and {-fy}.]
   1. To make pure or clear from material defilement, admixture,
      or imperfection; to free from extraneous or noxious
      matter; as, to purify liquors or metals; to purify the
      blood; to purify the air.

   2. Hence, in figurative uses:
      (a) To free from guilt or moral defilement; as, to purify
          the heart.

                And fit them so Purified to receive him pure.
                                                  --Milton.
      (b) To free from ceremonial or legal defilement.

                And Moses took the blood, and put it upon the
                horns of the altar, . . . and purified the
                altar.                            --Lev. viii.
                                                  15.

                Purify both yourselves and your captives. --
                                                  Num. xxxi. 19.
      (c) To free from improprieties or barbarisms; as, to
          purify a language. --Sprat.

Source : WordNet®

purifying
     adj 1: serving to purge or rid of sin; "purgatorial rites" [syn: {purgatorial},
             {purging}]
     2: freeing from noxious matter; "filtration is a purifying
        agent" [ant: {adulterating}]
     3: acting like an antiseptic [syn: {cleansing}]