Source : Webster's Revised Unabridged Dictionary (1913)

Effeminize \Ef*fem"i*nize\, v. t.
   To make effeminate. [Obs.]

Source : WordNet®

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