- inability to perceive or distinguish certain colors, especially red-green color blindness. It has various forms and degrees. John Pringle Nichol
- The Nuttall Encyclopedia
Dal"ton*ism (?), n. Inability to
perceive or distinguish certain colors, esp. red; color blindness. It
has various forms and degrees. So called from the chemist
Dalton, who had this infirmity. Nichol.
- Webster's Unabridged Dictionary (1913)
Daltonism, colour-blindness (q. v.). See
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