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Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   Neutralizer \Neu"tral*i`zer\, n.
      One who, or that which, neutralizes; that which destroys,
      disguises, or renders inert the peculiar properties of a
      body.
      [1913 Webster]