IPA: /ˈtrɛʒ.ər/
KK: /ˈtrɛʒər/
A person responsible for managing and overseeing the money and financial matters of an organization, such as a government, corporation, or club.
The treasurer presented the financial report at the annual meeting.
Treasurer → It is formed from "treasure" (from Old French *tresor*, meaning wealth or valuable items) and "-er" (meaning a person who). A treasurer is a person who manages or oversees valuable items or wealth.
Think of someone who manages 'treasure' — that's what a treasurer does, they are the person responsible for overseeing wealth.