A person who disherits someone; one who deprives another of their inheritance.
From 'disherit' plus the agent suffix '-or' (from Latin '-or,' indicating one who performs an action). The word emerged in English legal language to identify the person responsible for removing inheritance rights from another.
In historical records, 'disheritors' were often painted as villains—King John, who disherited many nobles, became so hated that barons forced him to sign the Magna Carta partly in response to his arbitrary disheritments.
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