ScienceSeptember 6, 2026
draff
DRAFF
Definition
The spent, leftover grains that remain after the mashing process in brewing or distilling.
Etymology
Derived from Middle English and Old Norse roots, the word originally referred to the dregs, grounds, or refuse of malt used in brewing.
In the news
In this article, draff is identified as a significant byproduct of the Scotch whisky industry, amounting to hundreds of thousands of tonnes annually that can be repurposed as feedstock for fermentation.
About a tenth of what comes out of malt whisky production is spirit, while Scotland's malt whisky industry produces almost 750,000 metric tons of spent barley and 2 billion liters of copper-laced pot ale a year, residues one Scottish firm has fermented into a petr
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