WordNet (r) 3.0 (2006):

damson plum
    n 1: tropical American timber tree with dark hard heavy wood and
         small plumlike purple fruit [syn: satinleaf, satin
         leaf, caimitillo, damson plum, Chrysophyllum
         oliviforme]
    2: plum tree long cultivated for its edible fruit [syn: damson
       plum, damson plum tree, Prunus domestica insititia]
    3: dark purple plum of the damson tree [syn: damson, damson
       plum]