Kalmar "Arshduchy" tana nufin wani yanki ko yankin Archduuke, wanda ya kasance memba na gidan sarauta ko daraja na sarauta. Ana amfani da kalmar don bayyana takamaiman yankin na tarihi ko siyasa, musamman a cikin mahallin na tsohon gidan Habsulck na Austria-Hungary, inda taken aka yi amfani da taken don tsara wasu membobin gidan sarauta. Ana iya yin tunanin Archduchy kamar nau'in Duchy, amma tare da mafi girman iko da kuma girma abokin aiki na mai mulkin sa.