noun Chemistry.

a white, crystalline, water-soluble hexose sugar, C6H12O6, 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 Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for galactose

Historical Examples of galactose

  • This was directly established for glucose, lævulose, galactose, and arabinose .

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

  • On saponifying, it is split up into digitogenin, galactose, and dextrose.

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

  • It will be seen that in one case the rate of fermentation of galactose was considerably greater than that of glucose.

British Dictionary definitions for galactose



a white water-soluble monosaccharide found in lactose. Formula: C 6 H 12 O 6
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

galactose in Medicine




A monosaccharide commonly occurring in lactose.brain sugar
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.