whit·en·er /ˈhwaɪtnɚ/
  Whit·en·er n.
  1. One who, or that which, whitens; a bleaching agent; a bleach; a bleacher; a blancher; a whitewasher.
  ◄ ►
  whitener
       n : an agent that makes things white or colorless [syn: bleaching
           agent, bleach, blanching agent]