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

1855–60; < German Pepton < Greek peptón, neuter of peptós cooked, digested, verbid of péptein

peptonelike, adjective
peptonic [pep-ton-ik] , adjective
peptonoid [pep-tuh-noid] , noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
peptone (ˈpɛptəʊn)
biochem See also proteose any of a group of compounds that form an intermediary group in the digestion of proteins to amino acids
[C19: from German Pepton, from Greek pepton something digested, from peptein to digest]

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American Heritage
Medical Dictionary

peptone pep·tone (pěp'tōn')
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.

pep·ton'ic (-tŏn'ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
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