lactuloseEnglishOxford New American Dictionarylactulose /ˈlaktyəlōs, ˈlæktjəloʊs / ▸ noun Chemistry a synthetic sugar with laxative properties. It is a disaccharide consisting of glucose and fructose units. – ORIGIN 1930s : from lacto- ‘of milk’, perhaps on the pattern of cellulose.