Daltonism

//ˈdɔːltənɪzəm// noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    An inability or defective ability to perceive or distinguish certain colors, especially red-green color blindness. uncountable

    "A person with Daltonism may be said to lack a discriminatory power that others have: his perceptions of red and green are, as such, not to be relied on."

  2. 2
    Alternative letter-case form of Daltonism. alt-of, uncountable
  3. 3
    dichromacy characterized by a lowered sensitivity to green light resulting in an inability to distinguish green and purplish-red wordnet
  4. 4
    Achromatopsia. uncountable

Synonyms

All synonyms
color blindnesscolor blindnesscolor vision deficiencydeuteranopiadeuteranopiadichromatism

Example

More examples

"A person with Daltonism may be said to lack a discriminatory power that others have: his perceptions of red and green are, as such, not to be relied on."

Etymology

From Dalton + -ism. Named after John Dalton (1766–1844), who suffered from the condition and conducted early research on it.

Related phrases

color blindness

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.