An Etymological Dictionary of the German Language/Annotated/Rettich
Rettich, Rettig, masculine, ‘radish,’ from the equivalent Middle High German rętich, rœtich, Old High German rętih, rā̆tī̆h, masculine; corresponding to Anglo-Saxon rœdič; borrowed from Latin râdîc-em (nominative râdix), which, as the High German guttural indicates, is found with the Teutonic accent prior to the Old High German period. English radish is a later loanword from French radis.