The yellow or orange parts in the center of eggs that contain nutrients and fat to feed a developing baby bird.
From Old English 'geoloca,' related to 'geolu' (yellow). The word has remained relatively unchanged for over 1,000 years, always referring to the yellow part of eggs.
The yolk isn't just food for the developing chick—it contains all the protein, fat, vitamins, and minerals the embryo needs for weeks of development without needing anything else. One egg yolk contains about 6 grams of pure protein!
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