noun[mass noun] Chemistry
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.
- 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.
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