milk sugar

milk sugar
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. [1913 Webster +PJC]

2. (Chem.) See {Galactose}. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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  • Milk sugar — Sugar Sug ar, n. [OE. sugre, F. sucre (cf. It. zucchero, Sp. az[ u]car), fr. Ar. sukkar, assukkar, fr. Skr. [,c]arkar[=a] sugar, gravel; cf. Per. shakar. Cf. {Saccharine}, {Sucrose}.] 1. A sweet white (or brownish yellow) crystalline substance,… …   The Collaborative International Dictionary of English

  • milk sugar — n LACTOSE …   Medical dictionary

  • milk sugar — n. LACTOSE …   English World dictionary

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