An Etymological Dictionary of the German Language/Annotated/räudig

by Friedrich Kluge

räudig, ‘scabby, mangy,’ from Middle High German riudec, Old High German riudig, older rûdîg, ‘scabiosus.’ Perhaps Old High German rû-da (from the Teutonic root hrû) is connected with Latin cruor, ‘gore,’ crû-dus, ‘bloody, raw,’ to which Anglo-Saxon hrûm, ‘soot,’ is probably akin.