Milk/mɪlk/ Definition 1 of 4Pro Tip 1/3Animal Origin Milk from mammals is often used in dairy products like cheese and butter. Cheese is made from the milk of cows. Pro Tip 2/3Cultural Staple In many cultures, cow's milk is a common drink and used in a variety of recipes. In many countries, children drink milk for strong bones. Pro Tip 3/3Nutrition Content Milk is a source of calcium and vitamins, important for health. She drinks milk every day for calcium.