The Collaborative International Dictionary of English v.0.48:

ilama \ilama\ n.
   1. A tropical American tree (Annona diversifolia) grown in
      the southern U. S. having a whitish pink-tinged fruit.

   Syn: ilama tree, Annona diversifolia.
        [WordNet 1.5]

   2. whitish tropical fruit with a pinkish tinge related to
      custard apples, grown in the southern U. S.
      [WordNet 1.5]

WordNet (r) 3.0 (2006):

Annona diversifolia
    n 1: tropical American tree grown in southern United States
         having a whitish pink-tinged fruit [syn: ilama, ilama
         tree, Annona diversifolia]