Internecine
Internecine , adjective
[Latin internecinus deadly, murderous, from internecare to kill, to slaughter; inter between + necare to kill; akin to Greek {not transcribed} dead. See Necromancy.]
1.
Involving, or accompanied by, mutual slaughter; mutually destructive.
Internecine quarrels, horrible tumults, stain the streets with blood.
2.
Of or pertaining to internal conflicts within a group; as, internecine quarrels.