angostura bark (ăngˌgəstŏrˈə, –styŏrˈə) [key], bitter bark of either of two South American trees ( Galipea officinalis and Cusparia felorifuga ) of the rue family. Formerly valued as a tonic and quinine substitute, it is now used in angostura bitters, an aromatic appetizer sometimes added to cocktails.
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