The Collaborative International Dictionary of English v.0.48:

Lucuma \Lu*cu"ma\, n. (Bot.)
   An American genus of sapotaceous trees bearing sweet and
   edible fruits.
   [1913 Webster]

   Note: Lucuma mammosum is called natural marmalade in the
         West Indies; Lucuma Caimito, of Peru, furnishes a
         delicious fruit called lucuma and caimito.
         [1913 Webster]

WordNet (r) 3.0 (2006):

caimito
    n 1: evergreen tree of West Indies and Central America having
         edible purple fruit star-shaped in cross section and dark
         green leaves with golden silky undersides [syn: star
         apple, caimito, Chrysophyllum cainito]