Source : Webster's Revised Unabridged Dictionary (1913)

Natal plum \Na*tal" plum`\ (Bot.)
   The drupaceous fruit of two South African shrubs of the genus
   {Arduina} ({A. bispinosa} and {A. grandiflora}).

Source : WordNet®

natal plum
     n 1: very large closely branched South African shrub having
          forked bright green spines and shiny leaves [syn: {amatungulu},
           {Carissa macrocarpa}, {Carissa grandiflora}]
     2: South African shrub having forked spines and plumlike fruit;
        frequently used as hedging [syn: {hedge thorn}, {Carissa
        bispinosa}]
     3: edible scarlet plum-like fruit of a South African plant
        [syn: {carissa plum}]