The Collaborative International Dictionary of English v.0.48:
Muhammadan \Mu*ham"mad*an\, Muhammedan \Mu*ham"med*an\, a. & n. Mohammedan. [1913 Webster]WordNet (r) 3.0 (2006):
Muhammedan n 1: a follower of Mohammed [syn: Mohammedan, Muhammedan, Muhammadan]