Source : Webster's Revised Unabridged Dictionary (1913)

Muezzin \Mu*ez"zin\ (m[-u]*[e^]z"z[i^]n), n. [Ar.]
   A Mohammedan crier of the hour of prayer. [Written also
   {mouezzin}, {mueddin}, and {muwazzin}.]

Source : WordNet®

muezzin
     n : the Muslim official of a mosque who summons the faithful to
         prayer from a minaret five times a day [syn: {muazzin}, {muadhdhin}]