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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
1835-1845
1835-45
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for color blindnesses

color blindness

n.

1844, replacing Daltonism (after English chemist John Dalton, 1766-1844, who published a description of it in 1794); in figurative use, with reference to race or ethnicity, attested from 1866, American English. Related: color blind (adj.).

Online Etymology Dictionary, © 2010 Douglas Harper
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color blindnesses in Medicine

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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Difficulty index for color blindness

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Word Value for color

7
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