An Etymological Dictionary of the German Language/Gallerte
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Gallerte, f., ‘jelly, from MidHG. galhert, galhart, galreide, f., ‘jelly of animal and vegetable matter.’ MidLat. galatina, ‘jelly,’ as well as Fr. gelée (from Lat. gelare), cannot, for phonetic reasons, serve as the source of the MidHG. word; the origin is still obscure.