excommunicator
/ˌɛkskəˈmjunəˌkeɪtər/
noun
- A person who officially excludes someone from membership in a religious community, especially the Christian church.
- The excommunicator read the sentence aloud in the cathedral before the assembled congregation.
- In medieval times, an excommunicator could cut off a person from all church sacraments.
- The bishop acted as the excommunicator, issuing the formal decree against the heretic.