Whey

имя существительное сыворотка Например: whey of butter — пахта

Большой англо-русский словарь

Whey

noun Etymology: Middle English, from Old English hwæg; akin to Middle Dutch wey whey the watery part of milk that is separated from the coagulable part or curd especially in the process of making cheese and that is rich in lactose, minerals, and vitamins and contains lactalbumin and traces of fat • wheylike adjective

Энциклопедический словарь Мерриама-Вебстера