An Etymological Dictionary of the German Language/Zins
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Zins, m., ‘tribute, rent, (plur.) interest,’ from MidHG. and OHG. zins, m., ‘duty, tribute.’ Borrowed during the OHG. period (comp. Kreuz) from Lat. census (Ital. censo), ‘census, tax.’ The HG. word passed in the form tins into OSax.; in Du., eijns.