(from the Latin Luna , the moon, because insane persons, especially those who had lucid intervals, were once supposed to be affected by the changes of the moon). This word is used twice in the New Testament-- (Matthew 4:24; 17:15) Translated epileptic in the Revised Version.) It is evident that the word itself refers to same disease affecting both the body and the mind, which might or might not be a sign of possession By the description of (Mark 9:17-26) it is concluded that this disease was epilepsy.
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Smith, William, Dr. "Entry for 'Lunatics'". "Smith's Bible Dictionary".