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Answer for the clue "Dichromacy characterized by a lowered sensitivity to green light resulting in an inability to distinguish green and purplish-red ", 9 letters:
daltonism

Word definitions for daltonism in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Daltonism \Dal"ton*ism\, 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. --Nichol.

Wiktionary Word definitions in Wiktionary
n. (alternative case form of Daltonism English)

Usage examples of daltonism.

Color blindness, a condition from which he suffered, was for a long time called Daltonism because of his studies.