DICT.TW Dictionary Taiwan

 dichromatopsia
 二色視

 di·chro·ma·top·sia /(ˌ)daɪˌkroməˈtɑpsɪə/ 名詞

 dichromatopsia
      n : a deficiency of color vision in which the person can match
          any given hue by mixing only two other wavelengths of
          light (as opposed to the three wavelengths needed by
          people with normal color vision) [syn: dichromacy, dichromatism,
           dichromia, dichromasy]