Sharp-tasting ales

• Dry, sharp-tasting ales
• Mai-tai ingredient
• Ingredient in a classic gin martini
• Flavoured alcoholic liquor
• Old-fashioned ingredient

WordNet Word definitions in WordNet
n. alcoholic liquor flavored with bitter herbs and roots

Wiktionary Word definitions in Wiktionary
n. A liquid used in mixed drinks or as a tonic into which bitter herbs have been steeped (it can also be found in powdered form for adding to mixed drinks).

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Bitters \Bit"ters\, n. pl. A liquor, generally spirituous in which a bitter herb, leaf, or root is steeped.

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1713, from bitter . So called for its taste.