\Mah"di\, n. [Ar., guide, leader.]
Among Mohammedans, the last imam or leader of the faithful.
The Sunni, the largest sect of the Mohammedans, believe that
he is yet to appear.
Note: The title has been taken by several persons in
      countries where Mohammedanism prevails, -- notably by
      Mohammad Ahmed, who overran the Egyptian Sudan, and in
      1885 captured Khartum, his soldiers killing General
      Gordon, an Englishman, who was then the Egyptian
      governor of the region.