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whey

Pronunciation: [HWAY; way]

The watery liquid that separates from the solids (curds) in cheesemaking. Whey is sometimes further processed into whey cheese (see cheese). It can be separated another step, with butter being made from the fattier share. Whey is also used in processed foods such as crackers. Primarily, however, whey is more often used as livestock feed than it is in the human diet.