• WordNet 3.6
    • n galactose a simple sugar found in lactose
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Webster's Revised Unabridged Dictionary
    • n Galactose (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 lactosethough it is not lactose proper).
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Century Dictionary and Cyclopedia
    • n galactose A crystalline dextrorotatory sugar, C6H12O6, produced by the action of dilute acids on milk-sugar.
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In literature:

This was directly established for glucose, laevulose, galactose, and arabinose (2).
"Researches on Cellulose" by C. F. Cross
Laevulose, galactose, maltose, lactose, etc., can be substituted in similar amounts for dextrose and the medium completed as above.
"The Elements of Bacteriological Technique" by John William Henry Eyre
When hydrolyzed it yields glucose, fructose, and two (or more) molecules of galactose.
"The Chemistry of Plant Life" by Roscoe Wilfred Thatcher
There are two common in foods, glucose and fructose; a third, galactose, is derived from more complex sugars.
"Foods and Household Management" by Helen Kinne

In news:

It is galactose-alpha-1,3-galactose, not alpha-galactosidase.