[ dawl-tn-iz-uhm ]
See synonyms for daltonism on Thesaurus.com
noun(sometimes initial capital letter)Pathology.
  1. color blindness, especially the inability to distinguish red from green.

Origin of daltonism

1835–45; J. Dalton + -ism

Other words from daltonism

  • dal·ton·ic [dawl-ton-ik], /dɔlˈtɒn ɪk/, adjective

Words Nearby daltonism

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use daltonism in a sentence

  • The diseases known as daltonism or colour-blindness, and hmophilia or the bleeding disease, are certainly hereditary.

    Parenthood and Race Culture | Caleb Williams Saleeby
  • Certain authorities on art are said to regard the great Montalbanais as a victim of daltonism—in other words, colour-blind!

    In the Heart of Vosges | Matilda Betham-Edwards
  • Colour-blindness or daltonism has been recorded (Horner) through the males only of seven generations.

    The Making of Species | Douglas Dewar
  • An interesting example is the common type of color blindness known as daltonism.

    Physiology | Ernest G. Martin
  • daltonism, dal′ton-izm, n. colour-blindness: inability to distinguish certain colours.

British Dictionary definitions for daltonism


/ (ˈdɔːltəˌnɪzəm) /

  1. colour blindness, esp the confusion of red and green

Origin of daltonism

C19: from French daltonisme, after John Dalton

Derived forms of daltonism

  • daltonic (dɔːlˈtɒnɪk), adjective

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012