One who annuls or voids something; a person authorized to cancel or nullify an agreement or status.
From the verb 'annul' (Late Latin 'annullare') with the agent suffix '-er' (one who performs an action). The word is rare in modern usage but appears in legal and historical documents.
In medieval and Renaissance Europe, the Pope was the ultimate 'annnuller'—he could annul marriages, void laws, and erase records with a single decree, making him the most powerful person in Christendom.
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