a color like that of egg yolk, ripe lemons, etc.; the primary color between green and orange in the visible spectrum, an effect of light with a wavelength between 570 and 590 nm.
the yolk of an egg.
a yellow pigment or dye.
Informal. yellow light.
Slang. yellow jacket ( def 2 ).
adjective, yellower, yellowest.
of the color yellow.
designating or pertaining to an Asian person or Asian peoples.
designating or pertaining to a person of mixed racial origin, especially of black and white heritage.
having a sallow or yellowish complexion.
Informal. cowardly.
(of a newspaper, book, etc.) featuring articles, pictures, or other content that is sensational, especially morbidly or offensively so: yellow rags; yellow biographies.
dishonest in editorial comment and the presentation of news, especially in sacrificing truth for sensationalism, as in yellow journalism; yellow press.
jealous; envious.
verb (used with object), verb (used without object)
to make or become yellow: Yellow the sheets with dye. The white stationery had yellowed with age.

before 900; 1895–1900 for def 9; Middle English yelou (adj. and noun), Old English geolo, geolu (adj.); cognate with Dutch geel, German gelb, Latin helvus pale-yellow; akin to Old Norse gulr

yellowly, adverb
yellowness, noun

9. craven, timorous, fearful.

It is perceived as insulting to use yellow to describe a person of Asian or mixed racial origin, as in the terms yellow peril and high yellow. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
yellow (ˈjɛləʊ)
1.  any of a group of colours that vary in saturation but have the same hue. They lie in the approximate wavelength range 585--575 nanometres. Yellow is the complementary colour of blue and with cyan and magenta forms a set of primary coloursRelated: xanthous
2.  a pigment or dye of or producing these colours
3.  yellow cloth or clothing: dressed in yellow
4.  the yolk of an egg
5.  a yellow ball in snooker, etc
6.  any of a group of pieridine butterflies the males of which have yellow or yellowish wings, esp the clouded yellows (Colias spp.) and the brimstone
7.  of the colour yellow
8.  yellowish in colour or having parts or marks that are yellowish: yellow jasmine
9.  having a yellowish skin; Mongoloid
10.  informal cowardly or afraid
11.  offensively sensational, as a cheap newspaper (esp in the phrase yellow press)
12.  to make or become yellow
Related: xanthous
[Old English geolu; related to Old Saxon, Old High German gelo, Old Norse gulr, Latin helvus]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. geolu, geolwe, from P.Gmc. *gelwaz (cf. O.S., O.H.G. gelo, M.Du. ghele, Du. geel, M.H.G. gel, Ger. gelb, O.N. gulr, Swed. gul "yellow"), from PIE *ghel-/*ghol- "yellow, green" (see Chloe). The verb meaning "to become yellow" is O.E. geoluwian. Adj. meaning "light-skinned"
(of blacks) first recorded 1808. Applied to Asiatics since 1787, though the first recorded reference is to Turkish words for inhabitants of India. Yellow peril translates Ger. die gelbe gefahr. Sense of "cowardly" is 1856, of unknown origin; the color was traditionally associated rather with treachery. Yellow-bellied "cowardly" is from 1924, probably a rhyming reduplication of yellow; earlier yellow-belly was a sailor's name for a half-caste (1867) and a Texas term for Mexican soldiers (1842, based on the color of their uniforms). Yellow dog "mongrel" is attested from c.1770; slang sense of "contemptible person" first recorded 1881.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

Yellow definition

A language from SRI proposed to meet the Ironman requirements which led to Ada.
["On the YELLOW Language Submitted to the DoD", E.W. Dijkstra, SIGPLAN Notices 13(10):22-26, Oct 1978].

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
It's famous for its yellow color, which stains almost everything it comes in
  contact with-even your skin.
Jaundice is a yellow color in the skin, the mucous membranes, or the eyes.
Green means they're doing well, yellow means they're faltering, and red means
  they might fail.
They range as some fuzzy blend of the original yellow with the background.
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