Whisky Glossary

March 04, 2020
 / 10 mins

Whisky Glossary

This is by no means the Oxford Dictionary of Whisky, but at any rate, it is a very thorough layman’s Whisky glossary.


ABV Alcohol By Volume (percentage)
ACE Additional Cask Enhancement. (See Cask Finish)
Age statement Years of maturation

Aldehydes Grassy, leathery aromas
American Oak White Oak or Quercus Alba—fast-growing wood with high vanillin content commonly used for whisky maturation
Amylase Enzyme used to convert starch into maltose
Angel’s Share Whisky lost to evaporation, normally about 2% per annum
Backset American: alcohol-free liquid left at the bottom of the still after distillation and is added to mash tun and washback to ward off bacterial contamination.
Balance Overall composition of a whisky. How well the flavours mesh and complement each other
Barley Cereal grain used in the production of whisky
Barrel (Cask) Large oak vessel used to store maturing spirit
Bere Barley  The oldest variety of barley in the British Isles, mainly to be found on the Isle of Orkney.
Blending  The act of combining one liquid with another. Used extensively to make all whiskies except single casks. Very important in bringing various desirable characteristics to the final product
Blended Malt Blend of malt whiskies from more two or more distilleries
Blended whisky  A blend of whiskies. Typically 40% malt 60% grain
Body Mouthfeel of a whisky
Bonded Storage Storage facilities where liquor is held prior to excise levies
Bourbon  A type of American whiskey made from a minimum of 51% corn, distilled to no more than 80% ABV and matured in new charred American oak barrels at no more than 62.5% ABV
Bottled in bond  An American term describing quality assurance stipulations laid out in the “Bottled-in-bond Act of 1897”. Whiskey Bottled-in-bond must come from one distillation season (January to December), one distiller at one distillery, be stored in a US bonded warehouse for 4 years minimum and bottled at 50% ABV
Brewing  The process of adding yeast to wort and fermenting this into wash
Burr Oak  Species of white oak native to North America used for whisky maturation
Butt  477.3 litre (105 gallons) Sherry cask – roughly twice that of a hogshead
Cask Strength Whisky bottled at barreling strength, typically between 55 – 70% ABV
Casks Oak barrels used for maturation
Cask finish The practice, in maturation, of transferring near mature whisky to another cask to capture some of that cask’s characteristics. E.g. Port or sherry finish.
Charring  Burning the inside of a barrel to ‘activate’ the wood. The char acts as a filter and imparts flavours to the liquid
Chill-filtration  A form of filtration used to “clear” (remove flock) whisky by lowering the temperature of the liquid between -10 and 4 degrees celcius and forcing the liquid through a fine filter. A necessary evil to produce huge volumes, but scorned for stripping whisky of its viscosity and colour, thereby necessitating the need for spirit-caramel
Column still Type of still used for grain whiskies. Capable of distilling continuously by re-heating of the liquid. Very efficient and can distill to as high as 96% in a single batch, vs a pot still that only does about 25 – 30% at a time
Condensation Change of the physical state of matter from gas to liquid
Congeners Substance produced during fermentation of alcoholic beverages said to provide the majority of taste characteristics present in whisky
Cooper The person who makes casks for a living
Corn  A grain used in whisk(e)y production. Very popular in America where it forms the basis of Bourbon. Out of all the grains, corn yields the highest level of alcohol.
Distillation  Physical process of separating the alcohol and flavours from water in the wash
Dram Measurement of whisky (glass)
Dramming Drinking whisky
Dressing  The removal of detritus or ‘combings’, principally rootlets form the malted grain
Drum Malting  Modern alternative to floor malting of barley. Basically a large, constantly turning drum
Dunnage Warehouse  Traditional style warehouse, with a slate roof, earthen floor and thick stone or brick walls. Expensive to run, but believed to produce a better whisky due to better airflow and higher humidity
Enzymes  Large biological molecules responsible for the thousands of metabolic processes that sustain life. Malting increases the incidence of enzymes which convert starch into fermentable sugar
Esters  Fruity, flowery aromas
European Oak 
Type 1. Quercus Robur also known as Pedunculate Oak. Widely used for brandy and sherry, fast-growing and high in tannins
Type 2. Quercus Petraea or Sessile Oak. Slower growing than Quercus Robur, with finer tannins and high vanillin content.
Evaporation  Change of the physical state of matter from liquid to gas
Excise Duty  Government tax imposed on beverage alcohol
Feints (Tails or Aftershots)  Unusable end of the second distillation run. Mainly made up of fusel alcohols and highly unpalatable
Fermentation  A metabolic process where yeast, a living organism, feeds on sugar creating acids, gases and/or alcohol as by-products
Finish Aftertaste of a whisky, measured in length, the longer the better, provided that it is in fact a nice taste
First fill  A barrel that is being used for the first time for whisky maturation. It would have been used in a different industry to hold another liquid previously, sherry, port or bourbon for example. These casks impart a very strong flavor on the spirit because there is still some of the previous liquid soaked into the wood. The cask’s effect on the spirit diminishes every time that it is used as there is less and less of the original liquid present in the wood
Floor malting  The traditional method used to malt grain on a malt house floor. Replaced in modern times (since the 1940s) in favour of more efficient processes such as drum malting
Foreshots (Heads)  Methanol rich first part of the second distillation run
Gorda  Large sherry cask
Grain Whisky  Whisky made from barley (malted or unmalted), wheat, maize or rye and distilled in a column still
Green Malt Germinated barley that has yet to be dried
Grist Course flour produced by finely grinding malted barley to produce wort
Grist Mill  Used to make grist
Heart Highly desirable middle part of second distillation. Contains sweet ethanol, perfect for whisky
Hogshead  238.7 litre (52.5 gallon) cask

IB  Independent bottling
Kiln Used to dry green malt, thereby halting germination
Low Wines  The produce of the first distillation or “wash run”
Madeira pipe  A 418 litre (92 gallons) cask used to mature madeira
Malt  Germinated barley that has been dried by heat
Malt Whisky  Whisky made from malted barley and water, distilled in a pot still, matured in oak casks.
Malting process  Inducing and halting germination in barley grain
Malt Kiln  Used to halt the germination process with heat
Marrying  Consolidation of several casks for further maturation
Mashing  The process of preparing the malt for brewing. Involves milling the malt into grist and steeping the grist to form wort
Mash Bill  Like a Mash Invoice, list of grains and proportions thereof used in American whiskey production. Typically a mix of corn, wheat, rye and barley
Mash Tun  A vessel used to convert the starches in crushed grains (grist) into sugars for fermentation
Maturation  he whisky is left a minimum of three years but usually between 8 and 25 years in wooden barrels to mature
NAS  No Age Statement
New Make Unmatured “new” spirit. Basically unfiltered grain vodka at this point.
Nose  Refers to both the smell of a whisk(e)y and the act of smelling a whisk(e)y
OB  Official / owner bottling
Octave  63-litre sherry cask
Overproof  ABV higher than 46%
Palate  Refers to the taste of a whisk(e)y
Peat  An accumulation of partially decayed vegetation formed in wetlands and used traditionally used a fuel. Used in whiskey as part of the kiln drying process in malting to impart smoky characteristics to the malt which later come out in the whisky. Islay is well known for its heavily peated whisky.
Peated Malt Malted barley that tastes strongly of peat smoke
Phenols  Peaty, smoky aromas also known as carbolic acid. Represent the chemical presence of peat in whisky
Pot still  A traditional type of still used for malt whisky and some American whiskeys. Made of copper and only capable of doing single batches at a time as opposed to a continuous still. Based on the Alembic still, created by Arabian alchemist Jabiibn Hayyan in the eighth century
Proof  American system of measuring AV
Puncheon  450 litre Sherry cask
Port Pipe 477.3 litre (105 gallon) cask initially used to mature port
PPM  Parts per million. Used to note the phenolic content of a substance (phenol parts per million).
Pure Malt  Another word for blended or vatted malt whisky.
Pure Pot Still – A variety of Irish whiskey referring to whisky, as that name suggests, that is distilled in a pot still and is not blended. Barely is used, both malted and unmalted.
Refill  This refers to casks that have been used a number of times to mature whisky and no longer imparts any character to the spirit
Reflux  The alcoholic vapour that doesn’t make it out of the still because it condenses and falls back into the still before reaching the condenser. Higher reflux produces a lighter, more delicate spirit
Regions  This refers to a geographical area in which whisk(e)y is produced. Each region imparts its unique influences on its whisky
Rye  A grain used in whisk(e)y production. Very popular in America and said to bring spicy characters
Quaich  Traditional drinking cup
Scotch  Whisky made in Scotland
Shell and Tube Condenser  The most widely used method of condensing alcoholic vapours. It is a copper tube surrounded by small copper pipes that are fed with cool water.
Single Malt  Malt whisky from one single distillery that has not been blended with whisky from another distillery
Skalk  First dram of the morning
Slainte Health! Gaelic drinking toast
SMSW  Single Malt Scotch Whisky
Solera A process for ageing liquids by fractional blending. Basically the oldest barrel is partly emptied for bottling and topped up with liquid from the second oldest barrel. This process continues all the way back to the first barrel which is filled with new spirit. Eventually, each barrel becomes a blend of various ages
Spirit  Distilled alcoholic beverage with an ABV above 20%
Spirit Caramel (E150)  Tasteless liquid used to colour whisky, giving it an older appearance. Popular with whiskies that have been chill-filtered
Spirit Safe  Locked container through which to view spirit leaving the still. Locked because of excise reasons, so that every drop that comes out of the still is accounted for and taxed. In the UK the key is held by HMRS
Spirit Still  The second still, used to re-distil the low wines produced by the wash still. Called a spirit still because it distils spirit
Straight Bourbon  American term referring to bourbon aged for at least two years and distilled to no more than 80% ABV
Straight Rye  Same as above, but this time it is whiskey made from at least 51% rye, distilled to no more than 80% ABV and aged for at least two years
Straight Wheat  Same as Straight Rye, only wheat this time
Straight Whiskey  You should be able to guess this by now…American term for Whiskey distilled from no more than 51% of any one grain, aged for at least two years and distilled to no more than 80% abv
Snifter  Nosing glass
Spirit thief  Also known as a valenche is a large pipette used to draw spirit from a barrel
Tumbler  Not to be used to appreciate whisky unless you are a Philistine
Terroir  A wine term used to describe the combined effect that a region’s location (climate, topography, aspect, altitude etc.) has on the wine. The same applies to whisky.
Triple Distillation  Distilling the liquid three times instead of the standard double distillation. The Irish and the Lowlands favour this method and it delivers a smoother, lighter spirit
Vatting  Blend of different whiskies
Vatted Malt  A blend of single malts from two or more distilleries
Vintage  Year of distillation
Virgin oak  Oak that has not yet been used to mature alcoholic beverage. While it is rarely used for Scotch, all Bourbon has to be matured in virgin oak
Wash  A rudimentary beer brewed from fermenting cereal grains. A liquid can only be distilled if there is alcohol present, thus the production of beer is the first stage in the production of whisk(e)y and this beer is called wash
Wash Receiver  A vessel used to collect the wash prior to distillation in the Wash Still.
Wash Still  The pot still used to distil the wash
Washback  The fermenter is which the wash is brewed
Wheat  A very common cereal grain used to make bread, flour and beer. Used to make grain whisky and American whiskies and ads smooth sweetness to the whisky
White Dog  American word for New Make
Worm Tub  A condenser made of a large tub of water in which a coiled copper tube is submerged. This cools the alcoholic vapour and causes them to condense into liquid
Wort  Fermentable solution containing maltose, made from steeping grist
Yeast  A microorganism from the Fungi kingdom central to alcohol production. Yeast causes fermentation by feeding on sugar and creating carbon dioxide and alcohol as by products
YO Years Old

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