Definition of "draff" []

• Dregs; the wash given to swin or cows; hogwash or waste matter (noun)

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• "They combined pot ale - the liquid from copper stills distillery equipment - and the spent grains used to make whisky, also known as draff, to produce butanol."
• ""GreenSwitch" technology to combine a liquid whisky by-product called "pot ale," solid waste from the original whisky grain -- "draff" -- and woodchip into fuel for the powerstation."
• "Researchers at Edinburgh Napier University produced a type of fuel called butanol using "pot ale" - the liquid residue from copper stills - and "draff," or leftover grain."