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2 definitions found
 for Daltonism
From The Collaborative International Dictionary of English v.0.48 :

  Daltonism \Dal"ton*ism\, n.
     Inability to perceive or distinguish certain colors, esp.
     red; color blindness. It has various forms and degrees. So
     called from the chemist Dalton, who had this infirmity.
     --Nichol.
     [1913 Webster]

From WordNet (r) 3.0 (2006) :

  Daltonism
      n 1: dichromacy characterized by a lowered sensitivity to green
           light resulting in an inability to distinguish green and
           purplish-red [syn: deuteranopia, Daltonism, green-
           blindness]

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