Definitions for lactoseˈlæk toʊs

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Random House Webster's College Dictionary

lac•toseˈlæk toʊs(n.)

  1. a disaccharide, C12H22O11, present in milk, that upon hydrolysis yields glucose and galactose.

    Category: Biochemistry

  2. 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

Princeton's WordNet

  1. 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"

Wiktionary

  1. lactose(Noun)

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

Webster Dictionary

  1. Lactose(noun)

    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

  2. Lactose(noun)

    see Galactose

U.S. National Library of Medicine

  1. Lactose

    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.


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