The Collaborative International Dictionary of English v.0.48:

icaco \icaco\ n.
   1. A small tropical American tree (Chrysobalanus icaco)
      bearing edible plumlike fruit.

   Syn: coco plum, coco plum tree, cocoa plum, Chrysobalanus
        icaco.
        [WordNet 1.5]

   2. A plum-shaped whitish to almost black fruit used for
      preserves.

   Syn: cocoa plum, coco plum.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

icaco
    n 1: small tropical American tree bearing edible plumlike fruit
         [syn: coco plum, coco plum tree, cocoa plum, icaco,
         Chrysobalanus icaco]
    2: plum-shaped whitish to almost black fruit used for preserves;
       tropical American [syn: cocoa plum, coco plum, icaco]