单词	monochromatism
释义	monochromatism /mɒnə(ʊ)ˈkrəʊmətɪz(ə)m / noun [mass noun] Complete colour blindness in which all colours appear as shades of one colour.The genetic cause has been determined for several color vision defects, achromatopsia (the loss of all color vision), blue monochromatism, protanopia, deuteranopia, and enhanced S-cone syndrome.... Dichromatism may have been lost repeatedly within the dabbling ducks, and thus it is possible that monochromatism is the derived state in Grey Teal (vs. dichromatism in the other taxa).
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