An Etymological Dictionary of the German Language/Annotated/Riege
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Riege, feminine, ‘row,’ from Middle High German rige, Old High German rī̆ga, feminine, ‘line, row’ (Gothic *riga, feminine, is wanting); allied to Reihe, Old High German rîhan, ‘to form in a row.’ From German are derived Italian riga, ‘line, strip,’ and rigoletto, ‘chain-dance.’