de·mo·ni·ac /dɪˈmoniˌæk/
  (a.)著魔的,惡魔的著魔的人
  De·mo·ni·ac Dem·o·ni·a·cal a.
  1. Pertaining to, or characteristic of, a demon or evil spirit; devilish; as, a demoniac being; demoniacal practices.
     Sarcastic, demoniacal laughter.   --Thackeray.
  2. Influenced or produced by a demon or evil spirit; as, demoniac or demoniacal power. “Demoniac frenzy.”
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  De·mo·ni·ac n.
  1. A human being possessed by a demon or evil spirit; one whose faculties are directly controlled by a demon.
     The demoniac in the gospel was sometimes cast into the fire.   --Bates.
  2. Eccl. Hist. One of a sect of Anabaptists who maintain that the demons or devils will finally be saved.
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  demoniac
       adj 1: in a murderous frenzy as if possessed by a demon; "the
              soldier was completely amuck"; "berserk with grief";
              "a berserk worker smashing windows" [syn: amuck, amok,
               berserk, demoniacal, possessed(p)]
       2: resembling or suggesting possession by a demon; "demoniac
          energy"; "a demoniacal fit" [syn: demoniacal]
       n : someone who acts as if possessed by a demon