bitter

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A preparation, usually of herbal origin, with a bitter taste, which allegedly triggers a cascade of sensory CNS responses—e.g., stimulation of appetite, increased flow of gastric and bile juices, hepatic detoxification, and effecting intrinsic repair of the gastrointestinal tract

bitter

(bĭt′ĕr) [AS. biter, strong]
Having a caustic, sharp, or disagreeable taste. It is one of the five taste senses (bitter, salty, savory, sour, and sweet).