Lactose (noun)

A disaccharide sugar that is the principal carbohydrate of milk and is composed of one molecule of glucose and one molecule of galactose.

Origin:

From latin lac, lactis "milk" + -ose.

Examples:

1. Lactose is found in milk and many dairy products.
2. Lactose intolerance is a common condition in which people have difficulty digesting lactose.
3. Some people may need to avoid lactose in their diet due to allergies or sensitivities.
4. The enzyme lactase is needed to break down lactose in the small intestine.
5. Lactose is often used as a filler in tablets and capsules.