maltosePronunciation: /ˈmɔːltəʊz, -s, mɒlt-/Definition of maltose noun [mass noun] Chemistry a sugar produced by the breakdown of starch, e.g. by enzymes found in malt and saliva. It is a disaccharide consisting of two linked glucose units. Origin: mid 19th century: from malt + -ose2maltose in other Oxford dictionaries Definition of maltose in the US English dictionary