IPA: /ˈpɛp.təʊn/
KK: /ˈpɛpˌtoʊn/
A type of protein that has been broken down into smaller parts, which can dissolve in water. It is often used in laboratory cultures to help grow bacteria.
The scientist added peptone to the culture medium to provide nutrients for the bacteria.
Peptone is derived from "pept" (from Greek "peptein", meaning to digest) and the suffix "-one" (used in chemistry to denote a substance). The word "peptone" refers to a substance that is a product of protein digestion, indicating its role in the digestive process.
Think of 'digesting' ('peptein') proteins to remember that 'peptone' is a substance formed during digestion.