(uncountable) A white liquid produced by the mammary glands of female mammals to nourish their young. From certain animals, especially cows, it is a common food for humans as a beverage or used to produce various dairy products such as butter, cheese, and yogurt.
The whitish fluid secreted by the mammary gland for the nourishment of the young; composed of carbohydrates, proteins, fats, mineral salts, vitamins, and antibodies.