Milk –noun
1. an opaque white or bluish-white liquid secreted by the mammary glands of female mammals, serving for the nourishment of their young.
2. this liquid as secreted by cows, goats, or certain other animals and used by humans for food or as a source of butter, cheeses, yogurt, etc.
3. any liquid resembling this, as the liquid within a coconut, the juice or sap of certain plants, or various pharmaceutical preparations.