ga·​lac·​tose | \ gə-ˈlak-ˌtōs How to pronounce galactose (audio) , -ˌtōz \

Definition of galactose

: a sugar C6H12O6 less soluble and less sweet than glucose

Examples of galactose in a Sentence

Recent Examples on the Web This type of linkage makes the sialic acid and galactose stick straight up. Quanta Magazine, 25 Feb. 2020 Avian influenzas prefer a linkage known as an α2,3 linkage, in which the sialic acid binds to the sugar galactose via a specific carbon atom. Quanta Magazine, 25 Feb. 2020 The second is disaccharides, which are just two of these single sugar molecules linked together: sucrose, or table sugar (glucose + fructose); lactose, or milk sugar (glucose + galactose); and maltose, or malt sugar (glucose + glucose). Carolyn L. Todd, SELF, 24 June 2019 The first is monosaccharides, or single sugar molecules, which include fructose, galactose, and glucose. Carolyn L. Todd, SELF, 24 June 2019 Mano a mannose The authors compared the tumor cells' growth on a variety of sugars: glucose, fructose, frucose, galactose, and mannose. Diana Gitig, Ars Technica, 21 Nov. 2018 Tests proved him right. Spraying experimental rice plants with artificial acid rain immediately cut their release into the soil of three relevant bacterial foodstuffs—fumaric acid, galactose and glucose. The Economist, 12 July 2018 The key to these virtually calorie-free sweeteners is that they are not broken down during digestion into natural sugars such as glucose, fructose and galactose, which are then either used for energy or converted into fat. Eunice Zhang, Washington Post, 3 June 2018 The alpha-gal allergy, as the red meat allergy is known, is actually caused by a sugar molecule found in meat — galactose-alpha-1,3-galactose. Max Londberg,, 29 June 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'galactose.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of galactose

1862, in the meaning defined above

History and Etymology for galactose

borrowed from French, from Greek galakt-, gála "milk" + French -ose -ose entry 2; from the occurrence of the sugar in milk — more at galaxy

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Time Traveler for galactose

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The first known use of galactose was in 1862

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Cite this Entry

“Galactose.” Dictionary, Merriam-Webster, Accessed 19 Jan. 2022.

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More Definitions for galactose


ga·​lac·​tose | \ gə-ˈlak-ˌtōs, -ˌtōz How to pronounce galactose (audio) \

Medical Definition of galactose

: an optically active sugar C6H12O6 that is less soluble and less sweet than glucose and is known in dextrorotatory, levorotatory, and racemic forms

More from Merriam-Webster on galactose

Nglish: Translation of galactose for Spanish Speakers Encyclopedia article about galactose


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