The Collaborative International Dictionary of English v.0.48:

akee \akee\ n.
   a tree (Blighia sapida) widely cultivated in tropical and
   subtropical regions for its fragrant flowers and colorful
   fruits; introduced in Jamaica by Captain Bligh of the HMS
   Bounty.

   Syn: akee tree.
        [WordNet 1.5]

   2. red pear-shaped tropical fruit with poisonous seeds; the
      flesh is poisonous when unripe or overripe.

   Syn: ackee
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Blighia sapida
    n 1: widely cultivated in tropical and subtropical regions for
         its fragrant flowers and colorful fruits; introduced in
         Jamaica by William Bligh [syn: akee, akee tree,
         Blighia sapida]