adj.
Pronunciation: ˌ in-t ə r- ' ne- ˌ s ē n, - ' n ē -s ə n, - ' n ē - ˌ s ī n, -n ə - ' s ē n; in- ' t ə r-n ə - ˌ s ē n
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>