A caked or compacted residue, especially the solid matter left after rendering animal fat or extracting oil from seeds.
From car- (uncertain origin, possibly from Old Norse) + cake. Alternatively, car- may relate to 'carcass.' Historical term from rendering and industrial processes.
Carcake was the unsold byproduct of making soap and lard—it was burned for fuel or fed to animals. Modern rendering plants still produce similar high-protein solids used in fertilizer and animal feed.
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