The Collaborative International Dictionary of English v.0.48:

Dika \Di"ka\, n. [Native West African name.]
   A kind of food, made from the almondlike seeds of the
   Irvingia Barteri, much used by natives of the west coast of
   Africa; -- called also dika bread.
   [1913 Webster]

WordNet (r) 3.0 (2006):

dika
    n 1: African tree with edible yellow fruit resembling mangos;
         valued for its oil-rich seed and hardy green wood that
         resists termites [syn: wild mango, dika, wild mango
         tree, Irvingia gabonensis]