Definition of Galactose

Galactose: A sugar contained in milk. Galactose makes up half of the sugar called lactose that is found in milk. Lactose is called a disaccharide, di meaning 2, since lactose is made up of two sugars, galactose and glucose, bound together.

Galactose is metabolized (used) through the action of an enzyme called GALT (galactose-1-phosphate uridyl transferase).