Exorcist, one who pretends to expel evil spirits by conjuration, prayers, and ceremonies. Exorcism was frequently practiced among the Jews. Matt. 12:27; Acts 19:13. David, by playing skillfully on a harp, procured the temporary departure of the evil spirit which troubled Saul. 1 Sam. 16:23. The power of casting out devils was bestowed by Christ while on earth upon the apostles, Matt. 10:8, and the seventy disciples, Luke 10:17-19, and was, according to his promise, Mark 16:17, exercised by believers after his ascension. Acts 16:18.