The Collaborative International Dictionary of English v.0.48:

Obi \O"bi\, n. [Prob. of African origin.]
   1. A species of sorcery, probably of African origin,
      practiced among the negroes of the West Indies. [Written
      also obe and obeah.] --De Quincey. --B. Edwards.
      [1913 Webster]

   2. A charm or fetich. [West Indies] --B. Edwards.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Obe \Ob"e\ ([=o]"b[-e]), n.
   See Obi.
   [1913 Webster]