dichromaticadj.n.

Brit.

/ˌdʌɪkrə(ʊ)ˈmatɪk/, U.S.

/ˌdaɪkrəˈmædɪk/,

/ˌdaɪkroʊˈmædɪk/

Forms: 1800s dicromatic, 1800s– dichromatic.

Origin: Formed within English, by compounding. Etymons: di- comb. form, chromatic adj.

Etymology: < di- comb. form + chromatic adj. Compare German dichromatisch involving two colours, dichroic (1829 or earlier), exhibiting dichromacy (1848 or earlier). Compare earlier monochromatic adj. With sense A. 1 compare earlier dichroitic adj. With sense A. 2 compare earlier dichromic adj.

A. adj.

a. Having, showing, or involving two colours. Sometimes: spec. = dichroic adj. Also figurative.

ΘΚΠ

the world > matter > colour > variegation > [adjective] > two colours

dichroitic1822

dichromatica1830

dichroic1849

dichroous1856

dichromic1860

dichroistic1877

bicolour1889

two-toned1897

twi-coloured1903

two-tone1906

bichrome1929

duotone1934

a1830 J. F. W. Herschel Light in Encycl. Metrop. (1845) IV. 433 Besides these, however, are to be remarked media in which the type has two maxima; such may be termed dichromatic, having really two distinct colours.

1876 New Englander (New Haven, Connecticut) July 511 The propensity of some part of the female population of Virginia to rush into these dichromatic embraces [i.e. between a white and a black person].

1910 Harvard Monthly Mar. 30 Your Hamlet appears in the flat; he is, at the present stage of color photography, monochromatic, or at most, dichromatic.

1940 Topogr. Drafting (U.S. War Dept.) vii. 112 This dichromatic printing and accompanying special glasses reproduce all conditions for binocular three-dimensional perception.

1962 Listener 28 June 1128/3 I am not sure that he [sc. a novelist] presents his world with justice; his characterization is too dichromatic.

2009 Daily Mail (Nexis) 17 June If there is a psychological term to describe Mr Bercow's character it is dichromatic—that is, consisting of only two colours, black and white. Shading and nuance are alien to his political make-up.

b. Zoology. Of an animal, esp. a bird: occurring in two different colour forms or morphs.

ΚΠ

1865 Zoologist 23 9744 Mr. J. J. Weir suggested that ‘dichromatism’, a ‘dichromatic variety’, would denote the phenomenon in question.

1884 E. Coues Key to N. Amer. Birds (ed. 2) 504 Plumage dichromatic in some cases; i.e. some individuals of the same species normally mottled gray, while others are reddish.

1998 Nature 30 Apr. 867/3 A bird species that is colourful to humans is clearly sexually dichromatic only in the spectrum that is invisible to humans.

2003 Sci. Amer. June 18/2 On average,..‘dichromatic’ bird species die out nearly 25 percent more often than their monochromatic relatives.

2. Ophthalmology and Physiology. Affected with or exhibiting dichromacy; of or relating to dichromacy. In early use also: †capable of distinguishing only black and white; = monochromatic adj. 3 (obsolete). Cf. dichromic adj. 1.

ΘΚΠ

the world > health and disease > ill health > a disease > disorders of eye > disordered vision > [adjective] > colour blind

dichromic1836

dichromatic1842

colour-blind1847

green-blind1868

red-blind1873

blue-blind1877

red–green1878

achromatopsic1883

dyschromatoptic1886

colour-weak1893

violet-blind1894

monochromatic1897

protanopic1898

protanomalous1911

tritanopic1915

deuteranomalous1932

tritanomalous1943

colour-defective1958

protan1961

1842 E. Wartmann in Rep. Brit. Assoc. Advancem. Sci. 1841 Addendum 41 There are two distinct classes of Daltonians, viz., the dichromatic, who can only discern two colours, commonly black and white..; and the polychromatic.

1894 Nature 21 June 192/1 A dichromatic eye..can only discriminate 140 differences.

1905 J. W. Baird Color Sensitivity of Peripheral Retina 21 The color sensitivity of the periphery is so weak as to approximate in some degree the condition of the dichromatic, or even of the monochromatic retina.

1959 Chambers's Encycl. V. 552/2 Subjects who have what is called two-colour (dichromatic) vision..could be of three varieties: red-blind subjects, green-blind subjects and blue-blind subjects.

1995 Guardian 2 Feb. (OnLine section) 9/4 Perhaps a red light might be slightly less salient for the dichromatic driver, but he is a trivial menace compared to the kind of police driver who sees a red light and drives through it at high speed anyway.

2011 Animal Behaviour 81 1053/1 The type of dichromatic vision identified in didelphimorphians differs from the one detected in monotremes.

B. n. Ophthalmology and Physiology.

= dichromat n. In early use also: †a person capable of distinguishing only black and white ;= monochromat n. (obsolete).

ΘΚΠ

the world > health and disease > ill health > a disease > disorders of eye > disordered vision > [noun] > colour blindness > person

idiopt1833

Daltonian1841

dichromatic1842

colour-blind1855

colour-defective1878

Daltonist1879

dichromat1893

monochromat1893

deuteranope1902

protanope1908

deuteranomal1915

protanomal1915

tritanope1915

protan1944

deutan1948

achromatopsic1986

1842 Museum Foreign Lit., Sci., & Art 16 149/2 The Daltonians form two classes..that of the dichromatics, who only discern two colours.., and that of the polychromatics.

1897 W. Thomson in W. F. Norris & C. A. Oliver Syst. Dis. Eye I. 600 We find people who can see only two colors in the whole spectrum. They are called dichromatics.

1921 Ophthalmic Lit. 17 355/1 Ten per cent of men and nearly one per cent of women are dichromatics or anomalous trichromatics.

2004 Ann. Rev. Ecol., Evol., & Systematics 35 355 The trichromatics [sc. marmosets], however, showed no higher detection rate of green food items compared with the dichromatics.

This entry has been updated (OED Third Edition, March 2014; most recently modified version published online March 2022).

单词	dichromatic
释义	dichromaticadj.n. Brit. /ˌdʌɪkrə(ʊ)ˈmatɪk/, U.S. /ˌdaɪkrəˈmædɪk/, /ˌdaɪkroʊˈmædɪk/ Forms: 1800s dicromatic, 1800s– dichromatic. Origin: Formed within English, by compounding. Etymons: di- comb. form, chromatic adj. Etymology: < di- comb. form + chromatic adj. Compare German dichromatisch involving two colours, dichroic (1829 or earlier), exhibiting dichromacy (1848 or earlier). Compare earlier monochromatic adj. With sense A. 1 compare earlier dichroitic adj. With sense A. 2 compare earlier dichromic adj. A. adj. 1. a. Having, showing, or involving two colours. Sometimes: spec. = dichroic adj. Also figurative. ΘΚΠ the world > matter > colour > variegation > [adjective] > two colours dichroitic1822 dichromatica1830 dichroic1849 dichroous1856 dichromic1860 dichroistic1877 bicolour1889 two-toned1897 twi-coloured1903 two-tone1906 bichrome1929 duotone1934 a1830 J. F. W. Herschel Light in Encycl. Metrop. (1845) IV. 433 Besides these, however, are to be remarked media in which the type has two maxima; such may be termed dichromatic, having really two distinct colours. 1876 New Englander (New Haven, Connecticut) July 511 The propensity of some part of the female population of Virginia to rush into these dichromatic embraces [i.e. between a white and a black person]. 1910 Harvard Monthly Mar. 30 Your Hamlet appears in the flat; he is, at the present stage of color photography, monochromatic, or at most, dichromatic. 1940 Topogr. Drafting (U.S. War Dept.) vii. 112 This dichromatic printing and accompanying special glasses reproduce all conditions for binocular three-dimensional perception. 1962 Listener 28 June 1128/3 I am not sure that he [sc. a novelist] presents his world with justice; his characterization is too dichromatic. 2009 Daily Mail (Nexis) 17 June If there is a psychological term to describe Mr Bercow's character it is dichromatic—that is, consisting of only two colours, black and white. Shading and nuance are alien to his political make-up. b. Zoology. Of an animal, esp. a bird: occurring in two different colour forms or morphs. ΚΠ 1865 Zoologist 23 9744 Mr. J. J. Weir suggested that ‘dichromatism’, a ‘dichromatic variety’, would denote the phenomenon in question. 1884 E. Coues Key to N. Amer. Birds (ed. 2) 504 Plumage dichromatic in some cases; i.e. some individuals of the same species normally mottled gray, while others are reddish. 1998 Nature 30 Apr. 867/3 A bird species that is colourful to humans is clearly sexually dichromatic only in the spectrum that is invisible to humans. 2003 Sci. Amer. June 18/2 On average,..‘dichromatic’ bird species die out nearly 25 percent more often than their monochromatic relatives. 2. Ophthalmology and Physiology. Affected with or exhibiting dichromacy; of or relating to dichromacy. In early use also: †capable of distinguishing only black and white; = monochromatic adj. 3 (obsolete). Cf. dichromic adj. 1. ΘΚΠ the world > health and disease > ill health > a disease > disorders of eye > disordered vision > [adjective] > colour blind dichromic1836 dichromatic1842 colour-blind1847 green-blind1868 red-blind1873 blue-blind1877 red–green1878 achromatopsic1883 dyschromatoptic1886 colour-weak1893 violet-blind1894 monochromatic1897 protanopic1898 protanomalous1911 tritanopic1915 deuteranomalous1932 tritanomalous1943 colour-defective1958 protan1961 1842 E. Wartmann in Rep. Brit. Assoc. Advancem. Sci. 1841 Addendum 41 There are two distinct classes of Daltonians, viz., the dichromatic, who can only discern two colours, commonly black and white..; and the polychromatic. 1894 Nature 21 June 192/1 A dichromatic eye..can only discriminate 140 differences. 1905 J. W. Baird Color Sensitivity of Peripheral Retina 21 The color sensitivity of the periphery is so weak as to approximate in some degree the condition of the dichromatic, or even of the monochromatic retina. 1959 Chambers's Encycl. V. 552/2 Subjects who have what is called two-colour (dichromatic) vision..could be of three varieties: red-blind subjects, green-blind subjects and blue-blind subjects. 1995 Guardian 2 Feb. (OnLine section) 9/4 Perhaps a red light might be slightly less salient for the dichromatic driver, but he is a trivial menace compared to the kind of police driver who sees a red light and drives through it at high speed anyway. 2011 Animal Behaviour 81 1053/1 The type of dichromatic vision identified in didelphimorphians differs from the one detected in monotremes. B. n. Ophthalmology and Physiology. = dichromat n. In early use also: †a person capable of distinguishing only black and white ;= monochromat n. (obsolete). ΘΚΠ the world > health and disease > ill health > a disease > disorders of eye > disordered vision > [noun] > colour blindness > person idiopt1833 Daltonian1841 dichromatic1842 colour-blind1855 colour-defective1878 Daltonist1879 dichromat1893 monochromat1893 deuteranope1902 protanope1908 deuteranomal1915 protanomal1915 tritanope1915 protan1944 deutan1948 achromatopsic1986 1842 Museum Foreign Lit., Sci., & Art 16 149/2 The Daltonians form two classes..that of the dichromatics, who only discern two colours.., and that of the polychromatics. 1897 W. Thomson in W. F. Norris & C. A. Oliver Syst. Dis. Eye I. 600 We find people who can see only two colors in the whole spectrum. They are called dichromatics. 1921 Ophthalmic Lit. 17 355/1 Ten per cent of men and nearly one per cent of women are dichromatics or anomalous trichromatics. 2004 Ann. Rev. Ecol., Evol., & Systematics 35 355 The trichromatics [sc. marmosets], however, showed no higher detection rate of green food items compared with the dichromatics. This entry has been updated (OED Third Edition, March 2014; most recently modified version published online March 2022). < adj.n.a1830
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