Hypertext Webster Gateway: "dichromacy"
From WordNet (r) 1.7 (wn)
dichromacy
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: {dichromatism}, {dichromatopsia},
{dichromia}, {dichromasy}]
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