These are clearly distinguished in Matthew 4:24 from those possessed by demons. The word is σεληνιαζόμενοι,which, like the word lunatic, is derived from 'the moon,' and is thought to embrace epileptics as well as those of unsound mind. The lad in Matthew 17:15 is called a lunatic, but he was also possessed by a demon: in Mark 9:25 it is called a 'dumb and deaf spirit.'
Originally published with the title A New and Concise Bible Dictionary by George Morrish (London), the Morrish Bible Dictionary is more than a dictionary of Bible words.Wikipedia
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