• (a.) Of or pertaining to fratricide; of the nature of fratricide.
Frat'ri·ci`dal adjective Of or pertaining to fratricide; of the nature of fratricide. 
fratricide, fratricidal, fratercide, fratercidal 1. One who kills his/her brother. 2. The action of killing one`s brother. 3. The crime in which someone kills his or her own brother.