1. One of the types of nutritive material stored in the ovum for the nutrition of the embryo; y. is particularly abundant and conspicuous in the eggs of birds. SYN: vitellus. 2. Fatty material found in the wool of sheep; when extracted and purified, it becomes lanolin. [A.S. geolca; geolu, yellow]
- white y. y. consisting of much finer particles than those of yellow y.; thin layers of it lie between the zones of yellow y. and form the latebra.
- yellow y. the chief constituent of the y. in a bird's egg; it consists of relatively coarse particles of stored food materials and is laid down in concentric zones with interposed thin layers of white y..

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yolk 'yōk n material stored in an ovum that supplies food to the developing embryo and consists chiefly of proteins, lecithin, and cholesterol

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a substance, rich in protein and fat, that is laid down within the egg cell as nourishment for the embryo. It is absent (or nearly so) from the eggs of mammals (including humans) whose embryos absorb nutrients from their mother.

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(yōk) [L. vitellus] 1. the stored nutrient of an oocyte or ovum. 2. crude wool fat or suint.

Medical dictionary. 2011.

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  • Yolk — (y[=o]lk or y[=o]k; 277), n. [OE. yolke, yelke, [yogh]olke, [yogh]elke, AS. geoloca, geoleca, fr. geolu yellow. See {Yellow}.] [Written also {yelk}.] [1913 Webster] 1. The yellow part of an egg; the vitellus. [1913 Webster] 2. (Zo[ o]l.) An oily… …   The Collaborative International Dictionary of English

  • yolk|y — «YOH kee, YOHL kee», adjective, yolk|i|er, yolk|i|est. 1. resembling yolk. 2. consisting of yolk. 3. British Dialect. greasy or sticky, as washed wool …   Useful english dictionary

  • yolk — [jəuk US jouk, jelk] n [U and C] ↑eggcup, ↑shell, ↑white, ↑yolk [: Old English; Origin: geoloca, from geolu; YELLOW1] the yellow part in the centre of an egg →↑white …   Dictionary of contemporary English

  • yolk — O.E. geolca, geoloca yolk, lit. the yellow part, from geolu yellow (see YELLOW (Cf. yellow)). Formerly also spelled yelk …   Etymology dictionary

  • yolk — [yōk] n. [ME yolke < OE geolca, yolk, lit., yellow part, akin to geolu,YELLOW] 1. the yellow, principal substance of an egg, as distinguished from the albumen, or white: see EGG1 2. Biol. the protein and fat stored in the ovum, serving as… …   English World dictionary

  • yolk — yolk. См. дейтоплазма. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • yolk — [ jouk ] noun count or uncount the middle part of an egg that is yellow …   Usage of the words and phrases in modern English

  • yolk — ► NOUN ▪ the yellow internal part of a bird s egg, which is rich in protein and fat and nourishes the developing embryo. DERIVATIVES yolked adjective yolky adjective. ORIGIN Old English, related to YELLOW(Cf. ↑yellowy) …   English terms dictionary

  • Yolk — Fondé en 1999 Fondateur Alban Darche, Sébastien Boisseau Jean Louis Pommier Genre(s) Jazz Pays d origine …   Wikipédia en Français

  • yolk — yolked, adj. yolkless, adj. yolky, adj. /yohk, yohlk/, n. 1. the yellow and principal substance of an egg, as distinguished from the white. 2. Embryol. the part of the contents of the egg of an animal that enters directly into the formation of… …   Universalium

  • yolk — [[t]jo͟ʊk[/t]] yolks N VAR The yolk of an egg is the yellow part in the middle. Only the yolk contains cholesterol. ...buttered toast dipped in egg yolk …   English dictionary

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