A muezzin is an official who calls from the tower of a mosque when it is time for Muslims to pray. a man who calls Muslims to prayer from a mosque (mu'adhdhin)
A crier who calls the faithful to prayer; among the Ashirra, the muezzin is sometimes a practitioner of the sihr blood magic able to use his voice to calm the Beast
From the Arabic mu'azzin, one who calls the faithful to prayer on the five occasions each day as prescribed