Meaning of yolk in English
Noun
1.
(a) the yellow part in the center of an egg; egg yolk
(b) Biology, the protein, lecithin, and cholesterol stored in an animal ovum, serving as nourishment for the developing embryo
Cholesterol is found in the egg yolk.
2. a natural fatty substance produced by the skin of a sheep, which is refined for making lanolin; a wool fat
3. ｟the -｠ Old use, the essential part of something; inner core