What is the yellow substance inside an egg called?
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4 min read
An egg yolk makes up about one-third of the total liquid weight of an egg, and it is also the source of the majority of an egg's vitamins and minerals. This dense, yellow substance is officially called the yolk, derived from the Old English word 'geolu' meaning yellow. Much more than just color, the yolk serves a vital role and contains a powerhouse of nutrients.