L l


    • US Pronunciation
    • US IPA
    • UK Pronunciation
    • UK IPA
    • [lak-tohs]
    • /ˈlæk toʊs/
    • /ˈlæk.təʊs/
    • US Pronunciation
    • US IPA
    • [lak-tohs]
    • /ˈlæk toʊs/

Definitions of lactose word

  • noun lactose Biochemistry. a disaccharide, C 12 H 22 O 11 , present in milk, that upon hydrolysis yields glucose and galactose. 1
  • noun lactose 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 and excipient. 1
  • noun lactose A sugar present in milk. It is a disaccharide containing glucose and galactose units. 1
  • noun lactose milk sugar 1
  • uncountable noun lactose Lactose is a type of sugar which is found in milk and which is sometimes added to food. 0
  • noun lactose a white crystalline disaccharide occurring in milk and used in the manufacture of pharmaceuticals and baby foods. Formula: C12H22O11 0

Information block about the term

Origin of lactose

First appearance:

before 1855
One of the 30% newest English words
First recorded in 1855-60; lact- + -ose2

Historical Comparancy

Parts of speech for Lactose


lactose popularity

A common word. It’s meaning is known to most children of preschool age. About 93% of English native speakers know the meaning and use the word.
Most Europeans know this English word. The frequency of it’s usage is somewhere between "mom" and "screwdriver".

lactose usage trend in Literature

This diagram is provided by Google Ngram Viewer

Synonyms for lactose

noun lactose

  • sugar — a sweet, crystalline substance, C 1 2 H 2 2 O 1 1 , obtained chiefly from the juice of the sugarcane and the sugar beet, and present in sorghum, maple sap, etc.: used extensively as an ingredient and flavoring of certain foods and as a fermenting agent in the manufacture of certain alcoholic beverages; sucrose. Compare beet sugar, cane sugar.
  • starch — a white, tasteless, solid carbohydrate, (C 6 H 1 0 O 5) n , occurring in the form of minute granules in the seeds, tubers, and other parts of plants, and forming an important constituent of rice, corn, wheat, beans, potatoes, and many other vegetable foods.
  • glucose — a sugar, C 6 H 12 O 6 , having several optically different forms, the common dextrorotatory form (dextroglucose, or -glucose) occurring in many fruits, animal tissues and fluids, etc., and having a sweetness about one half that of ordinary sugar, and the rare levorotatory form (levoglucose, or -glucose) not naturally occurring.
  • cellulose — Cellulose is a substance that exists in the cell walls of plants and is used to make paper, plastic, and various fabrics and fibres.
  • galactose — a white, crystalline, water-soluble hexose sugar, C 6 H 12 O 6 , obtained in its dextrorotatory form from milk sugar by hydrolysis and in its levorotatory form from mucilages.

Top questions with lactose

  • what is lactose?
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See also

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