An Etymological Dictionary of the German Language/Annotated/Gekröse
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Gekröse, neuter, ‘giblets; frill, ruffle,’ from Middle High German gekrœse, neuter, ‘the small intestine,’ also the variant krœse, Old High German *chrôsi; akin to Dutch kroes, kroost, ‘giblets of ducks and geese.’ All the cognates are probably connected with kraus.