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What is "lactose"

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lactose
Longman Dictionary of Contemporary English
lactose
noun
COLLOCATIONS FROM OTHER ENTRIES
food/glucose/lactose intolerance
COLLOCATIONS FROM CORPUS
■ NOUN
intolerance
▪ They may be at the root of colic, which is why lactose intolerance is important here.
▪ Many say, for example, that lactose intolerance is mostly in the minds of consumers.
EXAMPLES FROM CORPUS
▪ Are you lactose intolerant kitty, just like me?
▪ Everything is lactose intolerant now. nineties disease.
▪ Gastrointestinal symptoms after the lactose load were reported by four patients.
▪ Many say, for example, that lactose intolerance is mostly in the minds of consumers.
▪ Taken in mid-morning, it coated the teeth and then incubated until lunchtime; the lactose fermented into lactic acid.
▪ They may be at the root of colic, which is why lactose intolerance is important here.
▪ Typically in these cases, sodium chloride has been substituted for powdered lactose or other carbohydrate.
The Collaborative International Dictionary
lactose

Galactose \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).

lactose

lactose \lac"tose`\ (l[a^]k"t[=o]s`), n.

  1. (Physiol. Chem.) The main sugar present in milk, called also sugar of milk or milk sugar. When isolated pure it is obtained crystalline; it is separable from the whey by evaporation and crystallization. It is a disaccharide with the formula C12H22O11, being chemically 4-([beta]-D-galactosido)-D-glucose. It has a slightly sweet taste, is dextrorotary, and is much less soluble in water than either cane sugar or glucose. Formerly called lactin. When hydrolyzed it yields glucose and galactose. In cells it may be hydrolyzed by the enzyme [beta]-galactosidase.

  2. (Chem.) See Galactose.

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Douglas Harper's Etymology Dictionary
lactose

sugar from milk, 1858, from French, coined by French chemist Marcelin-Pierre-Eugène Berthelot (1827-1907) from Latin lac (genitive lactis) "milk" (see lactation) + chemical suffix -ose (2).

Wiktionary
lactose

n. (context carbohydrate English) The disaccharide sugar of milk and dairy products, C12H22O11, (a product of glucose and galactose) used as a food and in medicinal compounds.

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WordNet
lactose

n. a sugar comprising one glucose molecule linked to a galactose molecule; occurs only in milk; "cow's milk contains about 4.7% lactose" [syn: milk sugar]

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Wikipedia
Lactose

Lactose is a disaccharide sugar derived from galactose and glucose that is found in milk. Lactose makes up around 2–8% of milk (by weight), although the amount varies among species and individuals, and milk with a reduced amount of lactose also exists. It is extracted from sweet or sour whey. The name comes from (gen. ), the Latin word for milk, plus the -ose ending used to name sugars.In 1856, Louis Pasteur named galactose "lactose". See:

  • Pasteur (1856) "Note sur le sucre de lait" (Note on milk sugar), Comptes rendus, 42 : 347-351. From page 348: ''"Je propose de le nommer lactose."'' (I propose to name it lactose.)

In 1860, Berthelot renamed it "galactose", and transferred the name "lactose" to what is now called lactose. See:

  • Marcellin Berthelot, Chimie organique fondée sur la synthèse [Organic chemistry based on synthesis] (Paris, France: Mallet-Bachelier, 1860), vol. 2, pp. 248-249 and pp. 268-270. It has a formula of CHO and the hydrate formula CHO·HO, making it an isomer of sucrose.
Related phrases:

Usage examples of "lactose".

Remember you’ll need glucose, lactose, dulcitol, sucrose, mannitol, maltose, xylose, arabinose, rhamnose, and one tube for indole production.

The subject was probably pericarditis, colitis, or the perils of lactose intolerance.

Although the tissue-salts are triturated in a base of lactose (sugar of milk) the sugar content of the tablets is so very tiny that no reaction should be experienced.