noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A form of color blindness. Involves a defect in distinguishing between red and green. uncountable, usually
2. 2
   dichromacy characterized by lowered sensitivity to long wavelengths of light resulting in an inability to distinguish red and purplish blue wordnet

Synonyms

All synonyms

color blindnessred blindnessred-blindness

Etymology

From proto- (“first (color)”) + an- (“without”) + -opia (“vision”).

Related phrases

color blindness

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