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." Milton.
DEMONIAC
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.)
Defn: One of a sect of Anabaptists who maintain that the demons or devils will finally be saved.
DEMONIACALLY
Dem`o*ni"a*cal*ly, adv.
Defn: In a demoniacal manner.
DEMONIACISM
Dem`o*ni"a*cism, n.
Defn: The state of being demoniac, or the practices of demoniacs.