1. the act of killing one's brother or sister
2. a person who kills their brother or sister

Examples

• The ancient tragedy depicted fratricide as one of the gravest crimes against family.
• In Shakespeare's plays, fratricide often serves as a catalyst for revenge and downfall.
• The historian examined the fratricide committed during the civil war between rival princes.
• He was convicted of fratricide after confessing to the death of his brother.
• The novel explores the psychological torment of a fratricide haunted by guilt.