galactose|gəˈlæktəʊs| [f.Gr. γαλακτ-, γάλα, milk + -ose2. Cf. dextrose.] (See quots.) 1869Roscoe Elem.Chem. 396 Dilute acids convert lactose into a peculiar glucose, called galactose.1878Kingzett Anim.Chem. 404 Milk sugar is also first converted into galactose before it ferments.