- the yellow and principal substance of an egg, as distinguished from the white.
- 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.
- the essential part; the inner core.
- a natural grease exuded from the skin of sheep.
Origin of yolk
before 1000; Middle English yolke, yelke, Old English geoloca, derivative of geolu yellow
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for yolk
Add the eggs, yolk, crème fraîche, and vanilla paste and whisk until smooth.Daniel Boulud Reveals His 4 Favorite Recipes From His New Cookbook
October 15, 2013
Separate an egg and season the yolk with grated long pepper.Fresh Picks
July 6, 2010
And while the yolk is a combination of fat and protein, the white is entirely protein.Julia Child's Master Class
August 4, 2009
Separate the egg, beat the yolk, and mix it with the potato.
(b) Explain how the yolk and the white of an egg may be separated.
Beat in the yolk, add pepper, salt, and cayenne; and stir in the cheese.
Remove it from the fire, and when cooled a little, stir in the yolk of the egg.
Add the grated cheese and seasoning, and mix with the yolk of egg.
- the substance in an animal ovum consisting of protein and fat that nourishes the developing embryoRelated adjective: vitelline
- a greasy substance secreted by the skin of a sheep and present in the fleece
Old English geoloca, from geolu yellow
Word Origin and History for 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
- 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 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.