pasteurized milk /pas″tərīzd/ [Louis Pasteur; Gk, izein, to cause; AS, moluc, milk] , milk that has been treated by heat to destroy pathogenic bacteria. By law, pasteurization requires a temperature of 145° F to 150° F for not less than 30 minutes, followed by a temperature of 161° F for 15 seconds, followed by immediate cooling. Pasteurized milk is sometimes produced by using the high-temperature short-time method in which the milk is heated to 270° F for 1 second.