Definition of Lactose

1. Noun. A sugar comprising one glucose molecule linked to a galactose molecule; occurs only in milk. "Cow's milk contains about 4.7% lactose"

Exact synonyms: Milk Sugar
Generic synonyms: Disaccharide

Definition of Lactose

1. n. 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.

Definition of Lactose

1. Noun. (carbohydrates) The disaccharide sugar of milk and dairy products, C12H22O11, (a product of glucose and galactose) used as a food and in medicinal compounds. ¹

¹ Source:

Definition of Lactose

1. a lactic sugar [n -S]

Medical Definition of Lactose

1. The major sugar in human and bovine milk. Conversion of lactose to lactic acid by Lactobacilli etc. Is important in the production of yoghurt and cheese. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)

Lexicographical Neighbors of Lactose

lactose (current term)
lactose-litmus agar
lactose carrier protein
lactose factors
lactose intolerance
lactose intolerant
lactose operon
lactose permease
lactose repressor
lactose synthase

Literary usage of Lactose

Below you will find example usage of this term as found in modern and/or classical literature:

1. Practical physiological chemistry by Philip Bovier Hawk (1918)
"lactose, the principal carbohydrate constituent of milk, is an important member of the disaccharide group. It occurs only in milk, except as it is found in ..."

2. A Handbook of Sugar Analysis: A Practical and Descriptive Treatise for Use by Charles Albert Browne (1912)
"The much greater solubility of the /3-lactose has rendered this form of ... lactose reduces Fehling's solution about 70 per cent as strongly as d-glucose. ..."

3. Diagnostic Methods, Chemical, Bacteriological and Microscopical: A Text-book by Ralph Waldo Webster (1920)
"lactose is found in the urine of women during the period of lactation and may be found ... In breast-fed children with gastrointestinal disturbance lactose ..."

4. Eating Hints: Recipes and Tips for Better Nutrition During Cancer Treatment edited by Yale New Haven Med Cntr, Yale-New Haven Medical Center Staff (1990)
"What Is lactose Intolerance? If you have lactose intolerance, it means you have problems digesting or absorbing the milk sugar called lactose. ..."

5. Outlines of Proximate Organic Analysis: For the Identification, Separation by Albert Benjamin Prescott (1877)
"The potassio cupric solution is reduced by lactose very nearly as readily as by Glucose (187, d and I) (distinction from Sucrose); one-third greater ..."

6. A Dictionary of Applied Chemistry by Thomas Edward Thorpe (1912)
"Cheese makers usually send their supply of whey to a central factory, where the lactose is separated. Before the whey is concentrated, it is heated and ..."

7. A Dictionary of Applied Chemistry by Thomas Edward Thorpe (1921)
"The crude lactose is now refined by dissolving it in water so as to form a solution ... The lactose thus obtained is again subjected to a similar refining ..."

8. Examination of Water, Chemical and Bacteriological by William Pitt Mason (1917)
"I. Inoculate lactose broth fermentation tubes as directed on page 152 and incubate at 37° ... Fish two most typical red colonies from III to lactose broth ..."

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