Milk is the white liquid produced by female mammals to feed their young, and humans commonly drink cow’s milk as a food. It contains water, fats, proteins, sugars, and vitamins.
From Old English ‘meolc’ or ‘meloc,’ related to words in many Germanic languages. The basic root is very old, reflecting how long humans have used milk.
Humans are unusual mammals because many of us keep drinking milk long after babyhood—and from other species. The ability to digest milk as an adult actually reshaped human genes in some populations.
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