I. ˈ ̷ ̷ ̷ ̷ˌsīd noun
( -s )
Etymology: in sense 1, from Middle English, from Middle French or Latin; Middle French, from Latin fratricida, from fratr-, frater brother + -cida -cide (killer); in sense 2, from Middle French or Latin; Middle French, from Latin fratricidium, from fratr-, frater + -cidium -cide (killing) — more at brother
1. : one that murders or kills his own brother or sister or some person (as a countryman) who stands in a relationship resembling that of a brother or sister
besides being a great lady she is also a fratricide , a moral coward and a tosspot — Time
2. : the act of a fratricide
II. noun
: the hypothetical destruction of incoming missiles aimed at closely spaced targets (as missile silos) by the effects of the first nuclear warhead to detonate