[1] : The Collaborative International Dictionary of English v.0.48

mohammedan \moham"medan\, n.
   a follower of mohammed, the founder of islam also called
   islamism or mohammedanism; an adherent of islam; one who
   professes mohammedanism or islamism; a muslim; a moslem; a
   musselman; -- this term is used mostly by non-moslems, and
   some moslems find it offensive. written also muhammadan,
   mahometan, mahomedan, etc.
   1913 webster +pjc
see also:
muhammadan mahometan mahomedan 

[2] : The Collaborative International Dictionary of English v.0.48

mohammedan \moham"medan\, a. from mohammed, fr. ar.
   muh'ammad praiseworthy, highly praised.
   of or pertaining to mohammed, or the religion and
   institutions founded by mohammed; in the latter sense,
   synonymous with islamic, the term preferred by moslems.
   written also mahometan, mahomedan, muhammadan, etc.
   1913 webster +pjc
see also:
islamic mahometan mahomedan muhammadan 

[3] : The Collaborative International Dictionary of English v.0.48

muhammadan \muham"madan\, muhammedan \muham"medan\, a.  n.
   mohammedan.
   1913 webster

[4] : WordNet (r) 2.0

muhammadan
     adj : of or relating to the arabian prophet muhammad or to the
           religion he founded syn: mohammedan
     n : a believer or follower of islam syn: muslim, moslem, mohammedan,
          muhammedan, islamist
see also:
mohammedan muslim moslem muhammedan islamist 

Muhammadan >> M Words
Muhammadan, definition of term: Muhammadan
muhammadan_pag1.html