The Collaborative International Dictionary of English v.0.48:

Moringa \Mo*rin"ga\, prop. n. [Malayam murunggi.] (Bot.)
   A genus of trees of Southern India and Northern Africa. One
   species (Moringa pterygosperma) is the horse-radish tree,
   and its seeds, as well as those of Moringa aptera, are
   known in commerce as ben or ben nuts, and yield the oil
   called oil of ben.
   [1913 Webster]