Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An inherited defect in perception of red and green; red-green colorblindness.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Alternative capitalization of Daltonism

from the GNU version of the Collaborative International Dictionary of English

  • n. 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.

from The Century Dictionary and Cyclopedia

  • n. Color-blindness.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. dichromacy characterized by a lowered sensitivity to green light resulting in an inability to distinguish green and purplish-red

Etymologies

After John Dalton.
(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

  • a victim of daltonism -- in other words, colour-blind!

    In the Heart of the Vosges And Other Sketches by a "Devious Traveller"

  • Red-green colorblindness is called "daltonisme" (daltonism in English), and they all come from the name of English physicist John Dalton, who studied and described the condition at the end of the 18th century.

    non-voyant - French Word-A-Day

  • Red-green colorblindness is called "daltonisme" daltonism in English, and they all come from the name of English physicist John Dalton, who studied and described the condition at the end of the 18th century.

    non-voyant - French Word-A-Day

  • In 2006, Pluto's status was downgraded to that of a Charles Lindbergh (1902-1974): the first aviator to fly solo across the Atlantic; flight pioneer Ludwig Prandtl (1875-1953), father of aerodynamics, shared this birth date daltonism

    Answers.com: Today's Highlights

  • "Theodore R. Weeks refers to 'national daltonism: the extreme difficulty nationalists had ... in perceiving and appreciating the viewpoints or needs of members of other nationalities."

    Answers.com: Today's Highlights

  • The DDB agency uses daltonism as an excuse to communicate a concept full of emotion.

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