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]