lactose, milk sugar (noun)

a sugar comprising one glucose molecule linked to a galactose molecule; occurs only in milk

"cow's milk contains about 4.7% lactose"

lactose (Noun)

The disaccharide sugar of milk and dairy products, CHO, (a product of glucose and galactose) used as a food and in medicinal compounds.

Lactose

Lactose is a disaccharide sugar derived from galactose and glucose that is found in milk. Lactose makes up around 2~8% of milk, although the amount varies among species and individuals. It is extracted from sweet or sour whey. The name comes from lac or lactis, the Latin word for milk, plus the -ose ending used to name sugars. It has a formula of C12H22O11.

Lactose

Lactose is a disaccharide sugar synthesized by galactose and glucose subunits and has the molecular formula C12H22O11. Lactose makes up around 2–8% of milk (by mass). The name comes from lac (gen. lactis), the Latin word for milk, plus the suffix -ose used to name sugars. The compound is a white, water-soluble, non-hygroscopic solid with a mildly sweet taste. It is used in the food industry.