monochromacy

Từ điển WordNet v3.1 - WordNet Dictionary

noun

complete color blindness;
colors can be differentiated only on the basis of brightness
• Syn:
monochromatism, monochromatic vision, monochromia, monochromasy
• Derivationally related forms:
monochromatic (for: monochromatism)
• Hypernyms:
color blindness, colour blindness, color vision deficiency, colour vision deficiency