IPA: /ɪnˈdaɪktər/
KK: /ɪnˈdaɪktər/
A person who formally accuses someone of a crime, usually in a legal context.
The indicter presented the evidence to the grand jury.
Indicter is formed from "indict" (from Latin "indictare", meaning to proclaim or announce) and "-er" (meaning a person who). The word "indicter" refers to a person who proclaims or announces charges against someone, typically in a legal context.
Think of someone who 'proclaims' ('indict') charges against another person — that's what an indicter does.