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[guh-lak-tohs] /gəˈlæk toʊs/
noun, Chemistry.
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.
Origin of galactose
First recorded in 1865-70; galact- + -ose2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for galactose
Historical Examples
  • But most of the natural gums yield a mixture of galactose, some pentose, and some complex organic acid.

    The Chemistry of Plant Life Roscoe Wilfred Thatcher
  • This was directly established for glucose, lævulose, galactose, and arabinose .

  • When glucose is mixed with the galactose the latter is said to be at first left untouched, but later it disappears very slowly.

  • A complex of products was obtained, from which galactose was isolated.

  • These bear the same relation to galactose that the preceding dextrosans do to their constituent hexoses.

    The Chemistry of Plant Life Roscoe Wilfred Thatcher
  • On saponifying, it is split up into digitogenin, galactose, and dextrose.

    Poisons: Their Effects and Detection Alexander Wynter Blyth
  • galactose occurs in the animal kingdom as one of the constituents of lactose, or milk-sugar.

    The Chemistry of Plant Life Roscoe Wilfred Thatcher
  • It will be seen that in one case the rate of fermentation of galactose was considerably greater than that of glucose.

    Alcoholic Fermentation Arthur Harden
  • There are two common in foods, glucose and fructose; a third, galactose, is derived from more complex sugars.

  • The temperature coefficient of the fermentation of galactose also differs slightly from that of the other hexoses.

    Alcoholic Fermentation Arthur Harden
British Dictionary definitions for galactose


/ɡəˈlæktəʊz; -əʊs/
a white water-soluble monosaccharide found in lactose. Formula: C6H12O6
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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galactose in Medicine

galactose ga·lac·tose (gə-lāk'tōs')
A monosaccharide commonly occurring in lactose. Also called brain sugar.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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galactose in Science
A monosaccharide commonly occurring in lactose and in certain pectins, gums, and mucilages. Chemical formula: C6H12O6.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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