Definition of daltonism in US English:

daltonism

noun

  • 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.’

Origin

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

Pronunciation

daltonism

/ˈdôlt(ə)nˌizəm//ˈdɔlt(ə)nˌɪzəm/