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.

1865–70; galact- + -ose2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
galactose (ɡəˈlæktəʊz, -əʊs)
a white water-soluble monosaccharide found in lactose. Formula: C6H12O6

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
galactose   (gə-lāk'tōs')  Pronunciation Key 
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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Example sentences
Lactose is extracted by removing proteins and then dissolved to form glucose and galactose.
The simplest include glucose, fructose, and galactose.
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