Source : Webster's Revised Unabridged Dictionary (1913)

Decolorize \De*col"or*ize\, v. t.
   To deprive of color; to whiten. --Turner. --
   {De*col`or*i*za"tion}, n.

Source : WordNet®

decolorize
     v : remove color from; "The sun bleached the red shirt" [syn: {bleach},
          {bleach out}, {decolor}, {decolour}, {decolourize}, {decolorise},
          {decolourise}, {discolorize}, {discolourise}, {discolorise}]