Definition of daltonism in English:


Pronunciation /ˈdôlt(ə)nˌizəm/ /ˈdɔlt(ə)nˌɪzəm/

See synonyms for daltonism on


another term for protanopia, a form of color-blindness
‘The number of colour-blind artists in the history of art is probably larger than usually assumed, bur it is not possible to demonstrate daltonism simply by looking at an artist's pictures.’
  • ‘The most common form of colorblindness is daltonism or a problem with red/green.’
  • ‘It is one of the tests of reference to screen daltonism.’


Mid 19th century from the name of John Dalton, John+ -ism.