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n.

Color blindness; inability to distinguish colors; Daltonism.

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(əkrōm-ətōp′sē-ə)
n

Total color blindness.

(ə-krō'mə-tŏp'sē-ə) or a·chro·ma·top·sy (ə-krō'mə-tŏp'sē)
n.

A severe congenital deficiency in color perception, often associated with nystagmus and reduced visual acuity. Also called achromatic vision, monochromatism.

[fr. Gk akhromatos, without color + -opsia]
/a krO muh TAHP see ah/
a visual defect marked by total color blindness, the colors of the spectrum being seen in grayscale tones