Source : Webster's Revised Unabridged Dictionary (1913)

Mohammedan \Mo*ham"med*an\, a. [From Mohammed, fr. Ar.
   muh['a]mmad praiseworthy, highly praised.]
   Of or pertaining to Mohammed, or the religion and
   institutions founded by Mohammed. [Written also {Mahometan},
   {Mahomedan}, {Muhammadan}, etc.]

Mohammedan \Mo*ham"med*an\, n.
   A follower of Mohammed, the founder of Islamism; one who
   professes Mohammedanism or Islamism.

Source : WordNet®

Mohammedan
     adj : of or relating to the Arabian prophet Muhammad or to the
           religion he founded [syn: {Muhammadan}]

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