Whisky Vocabulary: Every Term Explained

Walk into any distillery or tasting room and you will hear a language of its own: wort, angels' share, first-fill, dram. Here is your complete translation guide: every essential whisky term, explained simply. Bookmark this page; it grows as the Society asks new questions.

Raw Materials & Fermentation

Malt / Malted barley: barley that has been soaked, allowed to germinate, and then dried. Germination unlocks the enzymes that convert starch into fermentable sugar.

Malting: the process above. Traditionally done on a malting floor, today mostly at specialist maltsters.

Peat: compressed, ancient vegetation cut from bogs. Burned to dry malt, it gives whisky its smoky character. Bar-bet fact: peat grows about one millimetre per year, so a metre-deep peat bank took a thousand years to form. Your Islay dram is burning prehistory.

Phenols / PPM: the smoky compounds absorbed by malt from peat smoke, measured in parts per million. Islay malts often sit at 30-50+ ppm.

Grist: milled malt, ready for mashing.

Mashing: mixing grist with hot water in a mash tun to dissolve the sugars.

Wort: the sweet, sugary liquid drawn off the mash tun.

Wash: wort after fermentation with yeast: essentially a strong, unhopped beer of 7-10% ABV, ready for distillation.

Washback: the large vessel (wooden or stainless steel) where fermentation happens.

Distillation

Pot still: the traditional copper kettle-shaped still, used in batches. Produces heavier, more characterful spirit. All Scotch single malt is pot-distilled.

Column still (Coffey still): a tall still that runs continuously, producing lighter, higher-strength spirit. Used for grain whisky and most bourbon. Bar-bet fact: its inventor was Irish, and Ireland rejected it. Scotland said yes, and won the world. (The full drama is in The Rise of Irish Whiskey.)

Spirit still / Wash still: in Scotch distilleries, the wash still performs the first distillation; the spirit still the second.

Cut / Cut points: the distiller's decision about which part of the spirit run to keep. The heart is kept; the foreshots (heads) and feints (tails) are redistilled.

New make spirit: the clear spirit straight off the still, before it touches oak.

Condenser: turns alcohol vapour back into liquid. Shell-and-tube condensers give a lighter spirit; traditional worm tubs give a heavier, meatier one. (My full deep-dive: Worm Tubs vs Shell & Tube.)

Lyne arm: the pipe carrying vapour from the still to the condenser. Its angle influences how much vapour falls back for redistillation, and therefore the spirit's weight.

Reflux: vapour condensing inside the still and being redistilled. More reflux means lighter, cleaner spirit.

Maturation & Casks

Cask / Barrel: the oak container where whisky matures. Sizes matter: barrel (~200L), hogshead (~250L), butt (~500L). (All the woods and sizes: The World of Casks.)

First-fill / Refill: a first-fill cask is being used for whisky for the first time after holding sherry or bourbon; it gives more flavour. Refill casks are gentler.

Ex-bourbon cask: American oak that previously held bourbon. Gives vanilla, coconut, honey.

Sherry cask (butt): European (or American) oak that held sherry. Gives dried fruit, spice, richness.

Charring / Toasting: heat treatment of the cask interior, unlocking flavour compounds in the oak. Bourbon requires new charred oak.

Angels' share: the whisky lost to evaporation during aging, roughly 2% per year in Scotland and far more in hot climates. Bar-bet fact: Scotland loses tens of millions of litres to the angels every year, more than many countries actually drink.

Finish (cask finishing): transferring matured whisky into a different cask for a final period, for example a port finish.

Age statement: the number on the label, always the YOUNGEST whisky in the bottle.

Mizunara: rare Japanese oak, prized for sandalwood and incense notes. Bar-bet fact: the tree must grow for well over a century before it can become a cask.

Styles & Categories

Single malt: whisky from one distillery, made from 100% malted barley, pot-distilled.

Single grain: whisky from one distillery, made from other grains (wheat, corn), usually column-distilled.

Blended whisky: a marriage of malt and grain whiskies from multiple distilleries. Around 90% of all Scotch sold is blended.

Blended malt: a blend of single malts only, no grain whisky.

Single cask: bottled from one individual cask. No two are identical.

Bourbon: American whiskey from at least 51% corn, aged in new charred oak.

Rye: American whiskey from at least 51% rye grain; spicier and drier than bourbon.

Single pot still: a uniquely Irish style using both malted and unmalted barley in a pot still. (Taste it in my Redbreast 12 note.)

Bottling & Label Terms

ABV: alcohol by volume. Legal minimum for Scotch is 40%.

Cask strength: bottled undiluted, straight from the cask, typically 55-65% ABV. (The living example: Aberlour A'bunadh.)

Chill filtration: cooling and filtering whisky to remove compounds that cause cloudiness. Non-chill filtered whiskies keep more texture and flavour.

E150 / Caramel colouring: permitted colour added for batch consistency. Natural-colour whiskies state it proudly.

Dram: a pour of whisky. The most useful word in this list.

Tasting Terms

Nose / Nosing: smelling the whisky; where most of tasting actually happens.

Palate: the flavours perceived in the mouth.

Finish: what remains after swallowing: short or long, warming, spicy, smoky.

Legs / Tears: the streaks whisky leaves on the glass wall; a hint about texture and strength, not quality.

Ester: fruity aromatic compounds created during fermentation. Think pear, apple, banana.

Now put the vocabulary to work: read How to Taste Whisky Like a Professional, then test yourself against my latest tasting notes. Missing a term? Ask the Society; I will add it to this page.