angostura bark ăng˝gəsto͝or´ə, –styo͝or´ə [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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