Source : Webster's Revised Unabridged Dictionary (1913)

Retouch \Re*touch"\, v. t. [Pref. re- + touch: cf. F.
   retoucher.]
   1. To touch again, or rework, in order to improve; to revise;
      as, to retouch a picture or an essay.

   2. (Photog.) To correct or change, as a negative, by
      handwork.

Retouch \Re*touch"\, n. (Fine Arts)
   A partial reworking,as of a painting, a sculptor's clay
   model, or the like.

Source : WordNet®

retouch
     v 1: give retouches to (hair); "retouch the roots"
     2: alter so as to produce a more desirable appearance; "This
        photograph has been retouched!" [syn: {touch up}]