An Etymological Dictionary of the German Language/Annotated/Zwietracht

Zwietracht, feminine, ‘dissension, discord,’ from Middle High German zwitraht, feminine, ‘disunion’; zwieträchtig, adjective, ‘discordant, at variance,’ from Middle High German zweitrehtc, ‘disunited, discordant’; as a Middle German word it is allied to treffen (compare Eintracht).