dichromatism

[dahy-kroh-muh-tiz-uhm]

di·chro·ma·tism

[dahy-kroh-muh-tiz-uhm]
noun
1.
the quality or state of being dichromatic.
2.
Also called di·chro·ma·top·si·a [dahy-kroh-muh-top-see-uh] . Ophthalmology. a defect of vision in which the retina responds to only two of the three primary colors. Compare monochromatism (def. 2), trichromatism (def. 3).

Origin:
1880–85; dichromat(ic) + -ism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Dichromatism is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Collins
World English Dictionary
dichromatic (ˌdaɪkrəʊˈmætɪk)
 
adj
1.  Also: dichroic having or consisting of only two colours
2.  (of animal species) having two different colour varieties that are independent of sex and age
3.  able to perceive only two (instead of three) primary colours and the mixes of these colours
 
dichromatism
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

dichromatism di·chro·ma·tism (dī-krō'mə-tĭz'əm)
n.

  1. The state of being dichromatic.

  2. A form of colorblindness in which only two of the three fundamental colors can be distinguished due to a lack of one of the retinal cone pigments. Also called dichromatopsia, dyschromatopsia, parachromatopsia.

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