noun Biochemistry.

any of a class of diffusible, soluble substances into which proteins are converted by partial hydrolysis.

Origin of peptone

1855–60; < German Pepton < Greek peptón, neuter of peptós cooked, digested, verbid of péptein
Related formspep·tone·like, adjectivepep·ton·ic [pep-ton-ik] /pɛpˈtɒn ɪk/, adjectivepep·to·noid [pep-tuh-noid] /ˈpɛp təˌnɔɪd/, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for peptone

Historical Examples of peptone

  • Protein, under the same conditions, is changed to a peptone.

    A Civic Biology

    George William Hunter

  • Thus, 7.5 grammes of peptone dissolved in water in such proportion as to make a five per cent.

    On Digestive Proteolysis

    R. H. Chittenden

  • On the other hand, when peptone was introduced in larger quantity, viz., in a twenty per cent.

    On Digestive Proteolysis

    R. H. Chittenden

  • Further, it is not enough to admit the formation of a single intermediate body, midway between syntonin and peptone.

    On Digestive Proteolysis

    R. H. Chittenden

  • On now testing a portion of the clear filtrate for peptone by the biuret test, not a trace of a reaction could be obtained.

    On Digestive Proteolysis

    R. H. Chittenden

British Dictionary definitions for peptone



biochem any of a group of compounds that form an intermediary group in the digestion of proteins to amino acidsSee also proteose
Derived Formspeptonic (pɛpˈtɒnɪk), adjective

Word Origin for peptone

C19: from German Pepton, from Greek pepton something digested, from peptein to digest
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for peptone

1860, from German Pepton, from Greek pepton, neuter of peptos "cooked, digested" (see peptic).

Online Etymology Dictionary, © 2010 Douglas Harper

peptone in Medicine




Any of various soluble compounds that do not coagulate, are obtained by acid or enzyme hydrolysis of natural protein, and are used as nutrients in culture media.
Related formspep•tonic (-tŏnĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.