• A disaccharide consisting of a galactose linked by a beta-1,4 glycosidic bond to a glucose.
  CRCH Nutrition Terminology
  Cancer Research Center of Hawaii, University of Hawaii, 2021
• A disaccharide of GLUCOSE and GALACTOSE in human and cow milk. It is used in pharmacy for tablets, in medicine as a nutrient, and in industry.
  NLM Medical Subject Headings
  U.S. National Library of Medicine, 2025
• A sugar found in milk and dairy products.
  Harvard Dictionary of Health Terms
  Harvard Medical Publishing, 2011
• A type of sugar found in milk and milk products.
  NCI Dictionary of Cancer Terms
  U.S. National Cancer Institute, 2021
• Sugar comprising one glucose molecule linked to a galactose molecule; occurs only in milk.
  CRISP Thesaurus
  National Institutes of Health, 2006
• Lactose, carbohydrate containing one molecule of glucose and one of galactose linked together. Composing about 2 to 8 percent of the milk of all mammals, lactose is sometimes called milk sugar. It is the only common sugar of animal origin. Lactose can be prepared from whey, a by-product of the...
  Encyclopedia Britannica
  Encyclopedia Britannica, Inc., 2025