Source : Webster's Revised Unabridged Dictionary (1913)

Angostura bark \An`gos*tu"ra bark`\
   ([aum][ng]`g[o^]s*t[=oo]"r[.a] b[aum]rk`). [From Angostura,
   in Venezuela.]
   An aromatic bark used as a tonic, obtained from a South
   American of the rue family ({Galipea cusparia, or
   officinalis}). --U. S. Disp.

Source : WordNet®

angostura bark
     n : the bitter bark of a South American tree; used in medicines
         and liqueurs and bitters [syn: {angostura}]