daltonismEnglishOxford New American Dictionarydaltonism /ˈdôlt(ə)nˌizəm, ˈdɔlt(ə)nˌɪzəm / ▸ noun another term for protanopia, a form of color-blindness. – ORIGIN mid 19th century : from the name of John Dalton, John + -ism.