Definition of galactose in English:

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Pronunciation: /ɡəˈlaktōs/


A sugar of the hexose class that is a constituent of lactose and many polysaccharides.
Example sentences
  • Its molecule is split in fermentation or digestion to yield the simple monosaccharide sugars dextrose and galactose.
  • The sugars glucose, galactose, and fructose all have six carbon atoms, twelve hydrogen atoms, and six oxygen atoms.
  • The enzyme lactase breaks down the lactose to galactose and glucose.


Mid 19th century: from Greek gala, galakt- 'milk' + -ose2.

For editors and proofreaders

Syllabification: ga·lac·tose

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