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 (dī-krō′mə-tĭz′əm) also di·chro·mism (-mĭz′əm)
1. The quality or condition of having or exhibiting two colors.
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 cone pigments.

di′cro·mat′ic (-măt′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(daɪˈkroʊ məˌtɪz əm)

1. the quality or state of being dichromatic.
2. Also called di•chro`ma•top′si•a (-ˈtɒp si ə) a defect of vision in which the retina responds to only two of the three primary colors.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.


1. the quality of being dichromatic, or having two colors.
2. a form of color blindness in which the sufferer can perceive only two of the three primary colors and their variants. — dichromatic, adj.
See also: Color
-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.dichromatism - a deficiency of color vision in which the person can match any given hue by mixing only two other wavelengths of light (as opposed to the three wavelengths needed by people with normal color vision)
color blindness, color vision deficiency, colour blindness, colour vision deficiency - genetic inability to distinguish differences in hue
yellow-blue color blindness, yellow-blue dichromacy - confusion of yellow and blue
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
APPENDIX Information on sexual dichromatism, mating system, and mean body mass of birds used in this study.
The gray color phase described for the species represents a special type of dichromatism, associated only with winter pelage and of only regional occurrence in Texas.
Comparative studies of polygynous birds controlling for the effects of phylogeny have described relatively weak associations between sexual dichromatism and male mating success (Hoglund 1989; Oakes 1992).
In this regard, Rostratula benghalensis is particularly interesting because (unlike most shorebirds) it shows pronounced sexual dichromatism; adult females are patterned more boldly than adult males, and juveniles of both sexes resemble the latter.
"Though fish can and do change color in response to their surroundings, sexual dichromatism (sex-related color variation) relates to sexual selection between males and females," he says.
eye defect, (2) myopic eye is corrected using., (3) long sightedness is also called., (4) in hypermetropia anteroposterior diameter of the eyeball., (5) the condition in which two eyes have unequal refractive error is called., (6) cylindrical lens used to correct which type of refractive error., (7) in protanopia which color cannot be appreciated., (8) out of the following which test is not used for color blindness, (9) central scotoma occurs in which condition of color blindness, and (10) condition of dichromatism in which there is defect in the receptor of third primary color is called.
These billfish species, as well as all others included in the family Istiophoridae, are dioecious (separate sexes) and none of them are known to display sexual dimorphism or dichromatism, but females of many species reach a larger size than males (Nakamura, 1985).
2012: Sexual dichromatism in frogs: natural selection, sexual selection and unexpected diversity.
Examining two standard assumptions of ancestral reconstructions: Repeated loss of dichromatism in dabbling ducks (Anatini).
Molecular phylogenetics and evolution of sexual dichromatism among populations of Yarrow's spiny lizard (Sceloporus jarrovii).
Dichromatism was observed when a light was shined along the c-axis (Figure 11): both samples showed a red tint when viewed down the longer light paths.