sucrosePronunciation: /ˈs(j)uːkrəʊz, -əʊs/Definition of sucrose noun [mass noun] Chemistry a compound which is the chief component of cane or beet sugar. A disaccharide containing glucose and fructose units; chemical formula: C12H22O11 Origin: mid 19th century: from French sucre 'sugar' + -ose2sucrose in other Oxford dictionaries Definition of sucrose in the US English dictionary