lactose
(ˈlæktəʊs)
[f. L. lact-, lac + -ose2. Cf. F. lactose.]
A saccharine substance present in milk, commonly called sugar of milk.
| 1858 Fownes' Chem. (ed. 7) 410 Sugar of milk; lactin; lactose. 1869 Roscoe Elem. Chem. 369 Lactose, or milk sugar, occurs only in the milk of mammalia. |