noun

• A sugar present in milk. It is a disaccharide containing glucose and galactose units.

  ‘The common sugars that form part of the diet are sucrose, lactose (milk sugar), and maltose.’

  More example sentences

  • ‘The enzyme lactase breaks down the lactose to galactose and glucose.’
  • ‘Soymilk does not contain lactose (milk sugar) and can be drunk by those who are allergic to normal milk.’
  • ‘Some babies are unable to digest the sugar lactose, which is in cow's milk formulas.’
  • ‘Some individuals may lose the ability to digest lactose and become lactose intolerant.’