GNU Collaborative International Dictionary of English

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  1.       
    
    Whitener , n.
    1. One who, or that which, whitens; a bleaching agent; a bleach; a bleacher; a blancher; a whitewasher.
      1913 Webster
    2. A chemical used as an adjunct to laundering white cloth, which makes white cloth appear whiter. A bluing agent.
      PJC

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