The Collaborative International Dictionary of English v.0.48:

Jambolana \Jam`bo*la"na\, n. [Cf. Pg. jambol[~a]o a kind of
   tropical fruit.] (Bot.)
   A myrtaceous tree of the West Indies and tropical America
   (Calyptranthes Jambolana), with astringent bark, used for
   dyeing. It bears an edible fruit.
   [1913 Webster] Jambool