səˈrȯrəˌsīd noun
( -s )
Etymology: in sense 1, from Medieval Latin sororicidium, from Latin soror sister + -i- + -cidium -cide (killing); in sense 2, from Latin sororicida, from soror + -i- + -cida -cide (killer)
1. : the act of killing one's sister
2. : a person who kills his sister