Material used as feed or food for animals; fodder, grain, or other nutritional substances given to livestock.
From 'feeding' plus 'stuff' (Old English 'stoffe,' from Old French), a compound creating a somewhat archaic or technical term for livestock feed, more common in British and formal agricultural contexts.
The word 'stuff' is wonderfully vague in English—it can mean almost any material or substance—which is why compounds like 'feedingstuff,' 'foodstuff,' and 'packing stuff' work so well; 'stuff' is the ultimate backup noun when you want to describe something without being too specific.
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