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Answer for the clue "Colors can be differentiated only on the basis of brightness ", 12 letters:
monochromacy

Alternative clues for the word monochromacy

Word definitions for monochromacy in dictionaries

Wikipedia Word definitions in Wikipedia
Monochromacy ( mono meaning one and chromo color) is among organisms or machine the ability to distinguish only one single frequency of the electromagnetic light spectrum. In the physical sense, no source of electromagnetic radiation is purely monochromatic, ...

WordNet Word definitions in WordNet
n. complete color blindness; colors can be differentiated only on the basis of brightness [syn: monochromatism , monochromatic vision , monochromia , monochromasy ]

Wiktionary Word definitions in Wiktionary
n. The quality of having only one independent channel for conveying color information in the eye, i.e. total color blindness.