IPA: /fərˈmɛntər/
KK: /fərˈmɛntər/
A device or container used to create the right environment for microorganisms to grow and produce substances like alcohol or antibiotics through fermentation.
The brewery uses a large fermenter to produce its craft beers.
Fermenter → It is formed from "ferment" (from Latin "fermentare", meaning to leaven or cause to rise) and "-er" (meaning a person who). A fermenter is a person or device that causes fermentation, typically in the context of brewing or food production.
Think of someone or something that 'causes to rise' ('ferment') — that's why a fermenter is involved in the process of fermentation.