[ noun ] the Muslim official of a mosque who summons the faithful to prayer from a minaret five times a day <noun.person>
muezzin \mu*ez"zin\ (m[-u]*[e^]z"z[i^]n), n. [Ar.] A Mohammedan crier of the hour of prayer; the Moslem official of a mosque who summons the faithful to prayer from a minaret five times a day. [Written also {mouezzin}, {mueddin}, {muazzin}, {mu'adhdhin}, and {muwazzin}.] [1913 Webster + WordNet 1.5]
The minaret has also raised fears among neighborhood residents that its balcony would be used by a muezzin, or crier, to call the faithful to prayer five times a day.