{ 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.

2. Influenced or produced by a demon or evil spirit; as, demoniac or demoniacal power. "Demoniac frenzy." Milton.

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.

2. (Eccl. Hist.) One of a sect of Anabaptists who maintain that the demons or devils will finally be saved.