the solids that remain after the liquids are pressed out of a foodstuff, such as when extracting olive oil, coconut cream, peanut oil, apple cider, etc. Generally they are used as animal fodder.
Best of all though are the cattle, especially when they are fed on those oilcakes.
James Joyce. Ulysses
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waiting for the passing of trucks which travelled over a certain route and were known to carry cattle feed, and which, when they jolted over the bad patches in the road, sometimes spilt a few fragments of oil-cake.
George Orwell. 1984 (1949)
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"Use of oil-cakes," continued the president. He was hurrying on: "Flemish manure-flax-growing-drainage-long leases-domestic service."