keto

¹ American  

[kee-toh] / ˈki toʊ /

adjective

Chemistry.

1. of or derived from a ketone.

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keto- ² American  

1. a combining form representing ketone in compound words.

   ketolysis.

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keto- British  

combining form

1. indicating that a chemical compound is a ketone or is derived from a ketone

   ketose

   ketoxime

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Usage

What does keto mean? Keto is short for ketogenic, referring to a diet that is low in carbohydrates but high in protein. While originating as a medical diet, it's popularly associated with weight loss.

Etymology

Origin of keto

First recorded in 1910–15; independent use of keto-

Example Sentences

I had a keto diet for most of this tour, and I thought that when I got back to carbs, I’d be more in moderation with it.

From Los Angeles Times • Dec. 11, 2025

These people probably enjoy Ironman competitions, keto and intermittent fasting.

From The Wall Street Journal • Nov. 7, 2025

"By switching to a keto diet, ketones are produced and used as an alternative fuel source. This may decrease the chance of developing Alzheimer's by preserving the health of brain cells."

From Science Daily • Oct. 21, 2025

You have to do keto but also be vegan.

From Slate • Jan. 1, 2025

Jerry, however, did not give a foolproof reason for preferring the keto forms.

From "Double Helix" by James D. Watson