From The Collaborative International Dictionary of English v.0.48:

Internecine \In`ter*ne"cine\, a. [L. internecinus deadly,
   murderous, fr. internecare to kill, to slaughter; inter
   between + necare to kill; akin to Gr. ? dead. See
   1. Involving, or accompanied by, mutual slaughter; mutually
      [1913 Webster]

            Internecine quarrels, horrible tumults, stain the
            streets with blood.                   --Motley.
      [1913 Webster]

   2. Of or pertaining to internal conflicts within a group; as,
      internecine quarrels.

   Syn: intramural.
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