2 definitions found From The Collaborative International Dictionary of English v.0.48 [gcide]: 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) 2.0 [wn]: Daltonism n : dichromacy characterized by a lowered sensitivity to green light resulting in an inability to distinguish green and purplish-red [syn: {deuteranopia}, {green-blindness}]
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