Main Entry: in·ter·ne·cine

Pronunciation: \ˌin-tər-ˈne-ˌsēn, -ˈnē-s^ən, -ˈnē-ˌsīn, -nə-ˈsēn; in-ˈtər-nə-ˌsēn\

Function: adjective

Etymology: Latin internecinus, from internecare to destroy, kill, from inter- + necare to kill, from nec-, nex violent death — more at noxious

Date: 1663

1 : marked by slaughter : deadly; especially : mutually destructive
2 : of, relating to, or involving conflict within a group <bitter internecine feuds>