Definitions for lactoseˈlæk toʊs
Random House Webster's College Dictionary
a disaccharide, C12H22O11, present in milk, that upon hydrolysis yields glucose and galactose.
a white, crystalline, sweet, water-soluble commercial form of this compound obtained from whey and used in infant feedings, in confections and other foods, in bacteriological media, and in pharmacology as a diluent.
Ref: Also called milk sugar.
Origin of lactose:
1855–60; < L lact-, s. of lac milk + -ose2
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"
The disaccharide sugar of milk and dairy products, CHO, (a product of glucose and galactose) used as a food and in medicinal compounds.
sugar of milk or milk sugar; a crystalline sugar present in milk, and separable from the whey by evaporation and crystallization. It has a slightly sweet taste, is dextrorotary, and is much less soluble in water than either cane sugar or glucose. Formerly called lactin
U.S. National Library of Medicine
A disaccharide of GLUCOSE and GALACTOSE in human and cow milk. It is used in pharmacy for tablets, in medicine as a nutrient, and in industry.