ke·​tone ˈkē-ˌtōn How to pronounce ketone (audio)
: any of a class of organic compounds (such as acetone) characterized by a carbonyl group attached to two carbon atoms
ketonic adjective

Examples of ketone in a Sentence

Recent Examples on the Web This releases ketones in the body, which can cause a person's blood to become acidic, leading to high blood sugar, nausea and vomiting, shortness of breath and more. Charlotte Phillipp, Peoplemag, 9 May 2024 Diabetics in particular need to be careful of higher ketone levels in their blood and urine, which could be signs of a serious condition known as ketoacidosis. Stephen C. George, Discover Magazine, 30 Apr. 2024 While specific products aren’t banned, the law states judges enforcing the measure could consider the inclusion of ingredients including creatine, green tea extract and raspberry ketone. Maysoon Khan, Fortune, 26 Apr. 2024 Listed below are the top BHB ketone supplement, 2022. Amber Smith, Discover Magazine, 7 Jan. 2024 At that instance, the body ketone level appreciates immensely. Amber Smith, Discover Magazine, 7 Jan. 2024 This stimulant-free fat-loss tool uses multiple pathways and established ingredients like raspberry ketones and green coffee bean extract to put your body in fat-melting mode without having to move an inch! Discover Magazine, 6 Jan. 2024 The breakdown of fat results in compounds called ketones, hence the name ketosis. Bruce Y. Lee, Forbes, 18 Feb. 2024 Detecting these early signs is important, though, because when cells can’t get enough glucose, the body breaks fat down into an alternate energy source called ketones. Carolyn L. Todd, SELF, 1 Nov. 2023

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'ketone.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


borrowed from German Keton, coinage based on Aceton acetone

Note: The German term Keton was apparently the coinage of the chemist Leopold Gmelin (1788-1853), who introduced it in Handbuch der organischen Chemie, 1. Band, 4. Auflage (Heidelberg, 1848), p. 40 passim. Gmelin characterized ketones as "Acetone im allgemeinen" ("acetones in general"), acetone being the smallest and simplest ketone.

First Known Use

1851, in the meaning defined above

Time Traveler
The first known use of ketone was in 1851

Dictionary Entries Near ketone

Cite this Entry

“Ketone.” Dictionary, Merriam-Webster, Accessed 21 May. 2024.

Medical Definition


ke·​tone ˈkē-ˌtōn How to pronounce ketone (audio)
: an organic compound (as acetone) with a carbonyl group attached to two carbon atoms

More from Merriam-Webster on ketone

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