IPA: /ˈpruːfər/
KK: /ˈpruːfər/
A person or device that checks written material for errors or a chamber used in baking to help dough rise.
The proofer helped the baker create perfect bread by providing the right environment for the dough to rise.
Proofer → It is formed from "proof" (from Old French *profe*, meaning evidence or test) and "-er" (meaning a person who). A proofer is a person who provides evidence or checks for accuracy.
Think of someone who provides 'evidence' ('proof') and is a 'person' ('-er') — that's what a proofer does.