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ke·​to ˈkē-(ˌ)tō How to pronounce keto (audio)
: of or relating to a ketone
also : containing the characteristic chemical group of a ketone consisting of a carbonyl attached to two carbon atoms
keto acids
: ketogenic sense 2
Since keto dieting is restrictive it's a good idea to consult with your doctor before starting.Ted Kallmyer


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: a ketogenic diet
Salad is great for keto, but the dressing might not be. When in doubt, skip it.John Nicholson
Keto is a diet trend that cuts out carbohydrates and sugars to stop the blood sugar from spiking and have the body enter a state of ketosis, a process in which body burns fat for energy because it does not have enough carbohydrates to burn.Dan Boudreaux


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combining form

: ketone : ketone body

Examples of keto in a Sentence

Recent Examples on the Web
Keto The keto diet is a high-fat, very-low-carbohydrate diet. Jamin Brahmbhatt, Verywell Health, 3 July 2024 The keto trend gave rise to brands devoted to selling products that fit the strict regimen. Danielle Wiener-Bronner, CNN, 3 July 2024
With a lineup of meals that can be reheated in as little as three minutes, Fresh N Lean's entirely gluten-free menu caters to a variety of diets, from keto to paleo to vegan. Nick Evans, Parents, 17 Aug. 2023 Price at time of publish: $29 Yellowbird Organic Hot Sauce Variety Set 9.8 oz View On Amazon Based in Texas, Yellowbird hot sauces are organic, keto friendly, paleo-vegan certified, gluten free, and Whole 30 friendly. Amanda Ogle, Southern Living, 28 Nov. 2023 See all Example Sentences for keto 

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

Word History



(sense 1) from construing of keto- as an adjective; (sense 2) by shortening


by shortening

Combining form

ket(one) + -o-

First Known Use


1891, in the meaning defined at sense 1


1994, in the meaning defined above

Time Traveler
The first known use of keto was in 1891

Dictionary Entries Near keto

Cite this Entry

“Keto.” Dictionary, Merriam-Webster, Accessed 19 Jul. 2024.

Medical Definition


ke·​to ˈkēt-(ˌ)ō How to pronounce keto (audio)
: of or relating to a ketone
also : containing a ketone group
Last Updated: - Updated example sentences
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