Lactose - Definitions from Dictionary.com

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Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This

lac·tose

Audio Help [lak-tohs] Pronunciation Key

–noun

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

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 and excipient.

Also called milk sugar, sugar of milk.

[Origin: 1855–60; lact- + -ose²

]

Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

Encyclopædia Britannica, Inc.
Lactose

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American Heritage Dictionary - Cite This Source - Share This

lac·tose Audio Help (lāk'tōs') Pronunciation Key
n.

A disaccharide, C₁₂H₂₂O₁₁, found in milk, that may be hydrolyzed to yield glucose and galactose.
A white crystalline substance obtained from whey and used in infant foods, bakery products, confections, and pharmaceuticals as a diluent and excipient. Also called milk sugar.

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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

Online Etymology Dictionary - Cite This Source - Share This
lactose

sugar from milk, 1858, from Fr., coined by Fr. chemist Marcelin-Pierre-Eugène Berthelot (1827-1907) from L. lac "milk" (see lactation) + suffix -ose.

WordNet - Cite This Source - Share This

lactose
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 American Heritage Science Dictionary - Cite This Source - Share This

lactose Audio Help (lāk'tōs') Pronunciation Key

A white crystalline disaccharide consisting of a glucose and a galactose molecule, found in milk and used in the manufacture of various other foods. Chemical formula: C₁₂H₂₂O₁₁.
The inability to digest lactose properly is called lactose intolerance. It is caused by a deficiency of the enzyme lactase and marked by abdominal cramping and other symptoms after ingesting lactose.

Webster's Revised Unabridged Dictionary - Cite This Source - Share This

lactose

Ga*lac"tose\, n. (Chem.) A white, crystalline sugar, C6H12O6, isomeric with dextrose, obtained by the decomposition of milk sugar, and also from certain gums. When oxidized it forms mucic acid. Called also lactose (though it is not lactose proper).

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