crystalline soluble disaccharide ... which occurs in the milk of all animals, and is manufactured from whey in cheese-making. It is less soluble and less sweet than sucrose, and is non-fermentable by ordinary yeasts, but in the lactic fermentation of milk is converted into lactic acid. It is hydrolysed by lactase into glucose and galactose., laktoos - piima koostisse kuuluv disahhariid, piimasuhkur