INTERNECINE

internecine (in-t<<schwa>>r-nee-sin or in-t<<schwa>>r-nee-sIn or in-t<<schwa>>r-nes-een), adj.1. Deadly; characterized by mass slaughter. 2. Mutually deadly; destructive of both parties <an internecine civil war>.3. Loosely, of or relating to conflict within a group <internecine faculty politics>.

[Blacks Law 8th]