sororicide
/səˈrɒrɪsʌɪd
/noun [mass noun]
1The killing of one’s sister.The most serious form of sibling abuse is fratricide and sororicide....
- Alonso eloquently regrets the sororicide and uxoricide he committed before he is beheaded.
- Freud seems to have been deaf to the importance in myth of both sororicide and fratricide.
1.1 [count noun] A person who kills their sister.Anna is barely sane; and Helen is a sororicide....
- Roman historians tend to present the sororicide in a positive light, stressing Horatia's father's public vindication of his son.
- My error was demonstrated to me in black and white: the sororicide had to be acquitted.
Origin
Mid 17th century (denoting a person who kills their sister, derived from Latin sororicida): the primary current sense comes from late Latin sororicidium, from soror 'sister' + -cidium (see -cide).