[{"Bold_text": "noun", "List Items": ["Biochemistry.a disaccharide, C12H22O11, present in milk, that upon hydrolysis yields glucose and galactose.", "a white, crystalline, sweet, water-soluble commercial form of this compound, obtained from whey and used in feedings, in confections and other foods, in bacteriological media, and in pharmacology as a diluent and excipient."]}]