The Collaborative International Dictionary of English v.0.48:

Abanga \A*ban"ga\ ([.a]*b[a^][ng]"g[.a]), n. [Name given by the
   negroes in the island of St. Thomas.]
   A West Indian palm; also the fruit of this palm, the seeds of
   which are used as a remedy for diseases of the chest.
   [1913 Webster] Abannation