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

Definition of peptone

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

First Known Use of peptone

1855, in the meaning defined above

History and Etymology for peptone

German Pepton, from Greek, neuter of peptos cooked

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The first known use of peptone was in 1855

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Cite this Entry

“Peptone.” Dictionary, Merriam-Webster, Accessed 21 Sep. 2020.

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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

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