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.
{ De*mo"ni*ac (?), Dem`o*ni"a*cal (?; 277), }
a. [L. daemoniacus, fr. daemon; cf.
F. démoniaque. See Demon.] 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.