pep·​tone | \ ˈpep-ˌtōn How to pronounce peptone (audio) \

Definition of peptone

: any of various water-soluble products of partial hydrolysis of proteins

Examples of peptone in a Sentence

Recent Examples on the Web Once completed, the 60,000 square foot biotech plant will be used to make animal-free peptone proteins that can be used to grow bacteria and other cultures in a lab. Dee Depass, Star Tribune, 22 June 2021

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

First Known Use of peptone

1855, in the meaning defined above

History and Etymology for peptone

German Pepton, from Greek, neuter of peptos cooked

Keep scrolling for more

Learn More About peptone

Time Traveler for peptone

Time Traveler

The first known use of peptone was in 1855

See more words from the same year

Dictionary Entries Near peptone




See More Nearby Entries 

Statistics for peptone

Cite this Entry

“Peptone.” Dictionary, Merriam-Webster, Accessed 24 Sep. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

Keep scrolling for more

More Definitions for peptone


pep·​tone | \ ˈpep-ˌtōn How to pronounce peptone (audio) \

Medical Definition of peptone

1 : any of various protein derivatives that are formed by the partial hydrolysis of proteins (as by enzymes of the gastric and pancreatic juices or by acids or alkalies), that are not coagulated by heat, and that are soluble in water but unlike proteoses are not precipitated from solution by saturation with ammonium sulfate
2 : a complex water-soluble product that contains peptones and other protein derivatives, is obtained by digesting protein (as meat) with an enzyme (as pepsin or trypsin), and is used chiefly in nutrient media in bacteriology


Test Your Vocabulary

Difficult Spelling Words Quiz

  • alphabet pasta spelling help
  • Which is the correct spelling?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!


Anagram puzzles meet word search.

Love words? Need even more definitions?

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