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col'or blind"ness

1. inability to distinguish one or several chromatic colors, independent of the capacity for distinguishing light and shade.
2. complete inability to distinguish colors of the spectrum, with all objects appearing as shades of gray, black, and white, varying only as to lightness and darkness; achromatopsia.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

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