The act of killing one's brother or sister, or a person who commits this act.
From Latin 'fratricide', combining 'frater' (brother) + '-cida' (killer). The term has been used since ancient times to describe this specific form of murder within families.
Fratricide appears constantly in mythology and history—Cain and Abel, Romulus and Remus—suggesting ancient societies were fascinated by how brotherhood could curdle into violence.
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