BEOLINGUS
Dictionary - TU Chemnitz

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worunter {adv} {prp} + which/what; which/what + {prp}

Worunter leidest du? What are you suffering from?

Den Muslimen stehen die "Leute des Buches" gegenüber, worunter der Koran vor allem Juden und Christen versteht. The Muslims recognise the 'People of the Book', by which the Koran means mainly Jews and Christians.