Source : Webster's Revised Unabridged Dictionary (1913)

Muhammadan \Mu*ham"mad*an\, Muhammedan \Mu*ham"med*an\, a. & n.
   Mohammedan.

Source : WordNet®

Muhammedan
     n : a believer or follower of Islam [syn: {Muslim}, {Moslem}, {Mohammedan},
          {Muhammadan}, {Islamist}]