noun
bill of indictment; written accusation
A formal legal document submitted to a court or prosecutor, detailing charges against a defendant.
検察官は裁判所に告発状を提出した。
The prosecutor submitted a bill of indictment to the court.
告訴状 is a criminal complaint filed by a victim, whereas 告発状 can be filed by any person, not necessarily the victim.
Compound of 告発 (accusation, indictment) and 状 (document, letter). The exact historical derivation is uncertain, but the term is a standard legal compound.