#disaccharide  any of a variety of carbohydrates that yield two monosaccharide molecules on complete hydrolysis
  supertype:  #oligosaccharide  any of the carbohydrates that yield only a few monosaccharide molecules on complete hydrolysis
  subtype:  #lactose__milksugar  a sugar comprising one glucose molecule linked to a galactose molecule; occurs only in milk; "cow's milk contains about 4.7% lactose"
  subtype:  #maltose__maltsugar  a white crystalline sugar formed during the digestion of starches
  subtype:  #sucrose  a complex carbohydrate found in many plants and used as a sweetening agent
     subtype:  #galactose__brain_sugar__brainsugar  a simple sugar found in lactose

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