ke·​to | \ ˈkē-(ˌ)tō How to pronounce keto (audio) \

Definition of keto

: of or relating to a ketone also : containing a ketone group

Examples of keto in a Sentence

Recent Examples on the Web

Those compounds are what cause keto breath: a metallic-tasting, somewhat stinky side effect. Jaclyn London, Ms, Rd, Cdn, Good Housekeeping, "9 Keto Diet Dangers Nutritionists Want You to Know About," 2 Jan. 2019

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

First Known Use of keto

1891, in the meaning defined above

History and Etymology for keto


Keep scrolling for more

Learn More about keto

Statistics for keto

Look-up Popularity

Time Traveler for keto

The first known use of keto was in 1891

See more words from the same year

Keep scrolling for more

More Definitions for keto


ke·​to | \ ˈkēt-(ˌ)ō How to pronounce keto (audio) \

Medical Definition of keto

: of or relating to a ketone also : containing a ketone group

More from Merriam-Webster on keto

Rhyming Dictionary: Words that rhyme with keto

Comments on keto

What made you want to look up keto? Please tell us where you read or heard it (including the quote, if possible).


transposition of initial sounds of words

Get Word of the Day daily email!

Test Your Vocabulary

Word Puzzles

  • alt 57589b2b4c6a3
  • Which answer pairs best with each of the following words? living, estate, club, music, road, mile
Spell It

Can you spell these 10 commonly misspelled words?

Syn City

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!