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color blindness

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color blindness

–noun
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.

Origin:
1835–45
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Medical Dictionary

color blindness n.
Deficiency of color perception, whether hereditary or acquired, partial or complete.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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