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yolk

[yohk, yohlk] /yoʊk, yoʊlk/
noun
1.
the yellow and principal substance of an egg, as distinguished from the white.
2.
Embryology. 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.
Origin
1000
before 1000; Middle English yolke, yelke, Old English geoloca, derivative of geolu yellow
Related forms
yolked, adjective
yolkless, adjective
yolky, adjective
Can be confused
yoke, yolk.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for yolky

yolk

/jəʊk/
noun
1.
the substance in an animal ovum consisting of protein and fat that nourishes the developing embryo related adjective vitelline
2.
a greasy substance secreted by the skin of a sheep and present in the fleece
Derived Forms
yolkless, adjective
yolky, adjective
Word Origin
Old English geoloca, from geoluyellow
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for yolky

yolk

Old English geolca, geoloca "yolk," literally "the yellow part," from geolu "yellow" (see yellow). Formerly also spelled yelk.

Online Etymology Dictionary, © 2010 Douglas Harper
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yolky in Medicine

yolk (yōk)
n.
The portion of the egg of an animal that consists of protein and fat from which the early embryo gets its main nourishment and of protoplasmic substances from which the embryo develops.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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yolky in Science
yolk
  (yōk)   
The yellow internal part of the egg of a bird or reptile. The yolk is surrounded by the albumen and supplies food to the developing young.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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