Essential Beer Terminology

Speaking Beer

Every field has its jargon, and beer is no exception. Knowing these terms will help you read labels, follow recipes, and hold your own in any beer conversation.

Measurement Terms

ABV (Alcohol By Volume) — The percentage of alcohol in the finished beer. Calculated from the difference between original and final gravity.

IBU (International Bitterness Units) — A measurement of hop-derived bitterness. Higher numbers mean more bitter, but perceived bitterness also depends on malt sweetness.

SRM (Standard Reference Method) — A scale measuring beer color. 2 SRM is pale straw; 40+ SRM is opaque black.

OG (Original Gravity) — The specific gravity of {{glossary:wort}} before {{glossary:fermentation}}. Indicates the total dissolved sugar content. A typical OG for a standard-strength beer is 1.045-1.060.

FG (Final Gravity) — The specific gravity after fermentation. Indicates how much sugar remains. Lower FG means a drier, more attenuated beer.

Process Terms

Mashing — Soaking crushed grain in hot water to convert starch to sugar via enzyme activity.

Lautering — Separating the sweet wort from spent grain after mashing.

Sparging — Rinsing the grain bed with hot water to extract remaining sugars.

Boil — The vigorous boiling of wort, typically 60-90 minutes, for sterilization and hop utilization.

Pitching — Adding yeast to cooled wort to begin fermentation.

Attenuation — The percentage of sugar that yeast has consumed. High attenuation (75-85%) yields a dry beer; low attenuation (60-70%) yields a sweet, full-bodied beer.

Conditioning — The maturation phase after primary fermentation when off-flavors are cleaned up and flavors meld.

Ingredient Terms

Malt — Grain that has been steeped, germinated, and kilned. The primary source of fermentable sugar in beer.

Hops — The flowers of the Humulus lupulus plant, providing bitterness, flavor, and aroma.

Adjunct — Any fermentable ingredient other than malted barley: corn, rice, oats, wheat, honey, fruit, sugar.

Dry Hopping — Adding hops to beer after fermentation for aroma without additional bitterness.

Flavor and Sensory Terms

Diacetyl — A butter or butterscotch-flavored compound produced by yeast. Desirable in small amounts in some English ales; a flaw in lagers and most other styles.

DMS (Dimethyl Sulfide) — A cooked-corn or creamed-corn aroma caused by incomplete boiling or slow wort cooling.

Ester — Fruity aroma compounds produced by yeast during fermentation. Common in ales.

Phenol — Spicy, clove-like, or smoky compounds produced by certain yeast strains or wild yeast.

Mouthfeel — The physical texture of beer on the palate: body, carbonation, astringency, and warmth.

Style Terms

Session — A beer with lower ABV (typically under 5%) designed for extended, multi-pint drinking sessions.

Imperial / Double — A stronger, more intense version of a base style. Often 8%+ ABV.

Single Hop — A beer brewed with only one hop variety to showcase its character.

Nitro — Beer served on a nitrogen-CO2 blend, producing a creamy, cascading pour with a tight, smooth head.