neuter in WordNet English dictionary

1. remove the ovaries of
   "Is your cat spayed?"
   alter  neuter  spay  castrate 
   

1. a gender that refers chiefly (but not exclusively) to inanimate objects (neither masculine nor feminine)
   neuter 
   

1. of grammatical gender
   "`it' is the third-person singular neuter pronoun"
   neuter 
   
2. having no or imperfectly developed or nonfunctional sex organs
   neuter  sexless