The Collaborative International Dictionary of English v.0.48:

Moslem \Mos"lem\ (m[o^]z"l[e^]m), n.; pl. Moslems
   (m[o^]z"l[e^]mz), or collectively Moslem. [Ar. muslim a
   true believer in the Mohammedan faith, fr. salama to submit
   to God, to resign one's self to the divine will. Cf. Islam,
   Mussulman.]
   An adherent of Islam; a Mussulman; an orthodox Mohammedan.
   [Written also muslim.] "Heaps of slaughtered Moslem."
   --Macaulay.
   [1913 Webster]

         They piled the ground with Moslem slain. --Halleck.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Muslim \Mus"lim\, n. & a.
   See Moslem.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Muslim
    adj 1: of or relating to or supporting Islamism; "Islamic art"
           [syn: Muslim, Moslem, Islamic]
    n 1: a believer in or follower of Islam [syn: Muslim,
         Moslem]