Source : Webster's Revised Unabridged Dictionary (1913)

Feminize \Fem"i*nize\, v. t. [Cf. F. f['e]miniser.]
   To make womanish or effeminate. --Dr. H. More.

Source : WordNet®

feminize
     v 1: assume (more) feminine characteristics; "feminized
          language"; "feminized frogs" [syn: {feminise}]
     2: to give a (more) feminine, effeminate, or womanly quality or
        appearance to; "This hairdo feminizes the man" [syn: {feminise},
         {effeminize}, {erreminise}, {womanize}]