The yellow part inside an egg that contains nutrients and becomes the baby bird or embryo.
From Old English 'geoloca,' from 'geolu' (yellow). Cognate with German 'Gelb' (yellow). The '-ock' suffix is archaic. The word literally means 'the yellow thing.'
Egg yolks are packed with choline, which is essential for brain development—ancient cultures didn't know this but intuitively fed eggs to pregnant women and children, and their bodies knew what their minds didn't!
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