Pronunciation: yok, yolk
- One of the types of nutritive material stored in the oocyte (ovum) for the nutrition of the embryo; yolk is particularly abundant and conspicuous in the eggs of birds.
- Fatty material found in the wool of sheep; when extracted and purified, it becomes lanolin.
[A.S. geolca; geolu, yellow]
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Examples: glitazone, GI cocktail, etc.