demasculinize

from WordNet (r) 3.0 (2006)

demasculinize
    v 1: remove the testicles of a male animal [syn: {emasculate},
         {castrate}, {demasculinize}, {demasculinise}]

from The Collaborative International Dictionary of English v.0.48

demasculinize \demasculinize\ v. t.
   to remove the testicles of a male animal.

   Syn: emasculate, castrate.
        [WordNet 1.5]

from Moby Thesaurus II by Grady Ward, 1.0

18 Moby Thesaurus words for "demasculinize":
      castrate, desex, desexualize, devitalize, effeminate, effeminatize,
      effeminize, emasculate, enervate, etiolate, exhaust, geld, sissify,
      soften, sterilize, unman, unnerve, womanize

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