An Etymological Dictionary of the German Language/räudig

by Friedrich Kluge

räudig, ‘scabby, mangy,’ from MidHG. riudec, OHG. riudig, older rûdîg, ‘scabiosus.’ Perhaps OHG. rû-da (from the Teut. root hrû) is connected with Lat. cruor, ‘gore,’ crû-dus, ‘bloody, raw,’ to which AS. hrûm, ‘soot,’ is probably akin.