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D.

A cattle feed made from a mixture of draff and pot ale.
Delivery Bay The Delivery Bay is the place where the barley arrives at the distillery. In the old days it would arrive in sacks on a horse and cart but nowadays it usually arrived in a road-going bulk grain tanker. In either case, the barley is then elevated by the Barley Intake, either a sack hoist or nowadays a vacuum pipe, to be stored in the Barley Loft which is usually the highest floor of the Malt House.
Demisting Point The point at which spirit coming off the Low Wines or Spirit Still no longer goes cloudy when water is added. It is the point at which the middle cut begins.
Diastase Enzyme complex secreted during germination of barley which converts starch to soluble starch and sugars. See also "Amylase", "Cytase" and "Zymase".
Distillation The process of heating the wash in the Wash Still, selecting the non-water condensate (the low wines), re-heating the low wines in the Low Wines or Spirit Still and selecting out only the middle cut of the condensate. Some distilleries re-heat, yet again, this middle cut to further exclude all but the purest ethanol from the new middle cut (triple distillation).
Distiller's Beer (US term) The fermented mash that is transferred from the fermenter to the beer still for the first distillation.
District A sub-area of one of the four whisky Regions of Scotland.
Dona Tub (US term) A vessel in which jug yeast is grown to produce enough yeast to ferment a whole batch of mash..
Doubler (US term) See "Low Wines or Spirit Still".
Doublings The spirit produced by a secondary distillation. Often referred to as high wines (but in US, confusingly, high wines are the product of the first distillation).
Draff The spent grist left at the bottom of the Mash Tun which is removed and sold to farmers as cattle feed.
Dram In Gaelic, a drink, commonly a large glass of whisky.
Drawback A rebate or reduction in the level of duty commonly applied to malt made from bear in the 19th Century.
Dreg Colloquial name for the residual leftovers from distillation - formerly bought by farmers and used as fertiliser.
Dresser The Dresser is a machine that removes the rootlets, shoots and other impurities from the malted barley prior to it being milled in the Roller Mill.
Dried Grains Cattle feed made from spent mashed cereal.
Drum Maltings A type of maltings in which the barley is germinated in large revolving drums through which air is drawn. A drum will usually have a capacity of 20 to 50 tons of barley.
Dun In gaelic, a fort or castle.
Dunnage The traditional means of racking casks in a Bonded Warehouse. Two wooden rails are laid in parallel along the top of a row of casks (or on the ground) and the next row of casks is rolled into position along the rails. Each cask is secured in place with wooden wedges on each side. Depending upon the height of the Bonded Warehouse, casks may be stacked up to five rows high. Although it appears precarious, dunnage is still in common use in many warehouses in Scotland.

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