An Etymological Dictionary of the German Language/Getreide
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Getreide, n., ‘grain, corn,’ from MidHG. getręgede, n., ‘everything that is carried, clothing, luggage; what the soil bears (flowers, grass), corn,’ even in late OHG. (11th cent.), gitręgidi, n., ‘revenue, possesion.’ The ModHG. sense is first found in 14th cent.