#oligosaccharide  any of the carbohydrates that yield only a few monosaccharide molecules on complete hydrolysis
  supertype:  #carbohydrate__saccharide__sugar  an essential structural component of living cells and source of energy for animals; includes simple sugars with small molecules as well as macromolecular substances; are classified according to the number of monosaccharide groups they contain
  subtype:  #disaccharide  any of a variety of carbohydrates that yield two 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
  subtype:  #tetrasaccharide  any of a variety of carbohydrates that yield four monosaccharide molecules on complete hydrolysis
     subtype:  #stachyose  a tetrasaccharide found in the tubers of the Chinese artichoke
  subtype:  #trisaccharide  any of a variety of carbohydrates that yield three monosaccharide molecules on complete hydrolysis
     subtype:  #raffinose  a trisaccharide that occurs in sugar beets and cotton seeds and certain cereals

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