Dryness is a property of alcoholicbeverages that describes the lack of a sweet taste. This may be due to a lack of sugars, the presence of some other taste that masks sweetness, or an underabundance of simple carbohydrates that can be converted to sugar by enzymes in the mouth (amylase in particular). The term "dry" may be applied to types of beer, wine, distilled spirits, or any other form of alcoholic beverage.
Contrary to popular belief, in a dry martini "dry" refers to the type of vermouth used, sweet or dry, not the amount of vermouth used in the drink. A dry martini refers to a martini made with dry vermouth and dry gin. A "perfect" martini—or any other cocktail that uses vermouth, such as a Perfect Manhattan—refers to a martini made with equal parts dry and sweet vermouth.