yolk

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 the embryo, together with any material that nourishes the embryo during its formation.
3. the essential part; the inner core.
4. a natural grease exuded from the skin of sheep.
Also, yoke.
[bef. 1000; ME yolke, yelke, OE geoloca, deriv. of geolu YELLOW]

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also called  Deutoplasm,  

      the nutritive material of an egg, used as food by a developing, embryonic animal. Eggs with relatively little, uniformly distributed yolk are termed isolecithal. This condition occurs in invertebrates and in all but the lowest mammals. Eggs with abundant yolk concentrated in one hemisphere of the egg are termed telolecithal. This occurs in many invertebrates and in all vertebrates lower than marsupial mammals. In arthropods, the yolk is massed near the centre of the egg; such eggs are termed centrolecithal.

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Universalium. 2010.

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Look at other dictionaries:

  • 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 — [[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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