Source : Webster's Revised Unabridged Dictionary (1913)

Voodoo \Voo"doo\, n.
   1. See {Voodooism}.

   2. One who practices voodooism; a negro sorcerer.

Voodoo \Voo"doo\, a.
   Of or pertaining to voodooism, or a voodoo; as, voodoo
   incantations.

Source : WordNet®

voodoo
     n 1: a charm superstitiously believed to embody magical powers
          [syn: {juju}, {hoodoo}, {fetish}, {fetich}]
     2: a religious cult practiced chiefly in Caribbean countries
        (especially Haiti); involves witchcraft and animistic
        deities [syn: {vodoun}, {voodooism}, {hoodooism}]
     v : bewitch by or as if by a voodoo