Etymology
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peptone (n.)

a general name for a substance into which the nitrogenous elements of food are converted by digestion, 1860, from German Pepton (1849), from Greek pepton, neuter of peptos "cooked, digested," verbal adjective of peptein "to cook" (from PIE root *pekw- "to cook, ripen"). Related: Peptonic.

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Definitions of peptone

peptone (n.)
any of various water-soluble compounds that form by hydrolysis in the digestion of proteins to amino acids;
From wordnet.princeton.edu