Source : Webster's Revised Unabridged Dictionary (1913)

   {Guinea plum} (Bot.), the fruit of {Parinarium excelsum}, a
      large West African tree of the order {Chrysobalane[ae]},
      having a scarcely edible fruit somewhat resembling a plum,
      which is also called {gray plum} and {rough-skin plum}.

   {Guinea worm} (Zo["o]l.), a long and slender African nematoid
      worm ({Filaria Medinensis}) of a white color. It lives in
      the cellular tissue of man, beneath the skin, and produces
      painful sores.

Source : WordNet®

Guinea worm
     n 1: a painful and debilitating infestation contracted by
          drinking stagnant water contaminated with Guinea worm
          larvae that can mature inside a human's abdomen until
          the worm emerges through a painful blister in the
          person's skin [syn: {Guinea worm disease}, {dracunculiasis}]
     2: parasitic roundworm of India and Africa that lives in the
        abdomen or beneath the skin of humans and other
        vertebrates [syn: {Dracunculus medinensis}]