Definitions for daltonism
deuteranopia, Daltonism, green-blindness(noun)
dichromacy characterized by a lowered sensitivity to green light resulting in an inability to distinguish green and purplish-red
Inability to perceive or distinguish certain colors, especially red-green color blindness. It has various forms and degrees.
Origin: Named for chemist John Dalton who had this condition
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
The Nuttall Encyclopedia
colour-blindness (q. v.). See Dalton, John.