Definition of glucose in US English:



  • 1A simple sugar which is an important energy source in living organisms and is a component of many carbohydrates.

    A hexose; chemical formula: C₆H₁₂O₆

    • ‘This effect seems to be restricted to sucrose; glucose and fructose do not produce the same result.’
    • ‘The procedure is based on the cleavage of sucrose by invertase to glucose and fructose.’
    • ‘Yeasts also contain a natural enzyme which will convert sucrose to its component glucose and fructose.’
    • ‘Epidermal cells contained low concentrations of sucrose, glucose and fructose, and no fructan.’
    • ‘Fructose and glucose dominated the sugar profile of leaves, sucrose was present at lower concentrations.’
    1. 1.1 A syrup containing glucose and other sugars, made by hydrolysis of starch and used in the food industry.
      • ‘Mix the icing sugar, water and glucose together and bring to the boil.’


Mid 19th century: from French, from Greek gleukos ‘sweet wine’, related to glukus ‘sweet’.