Webster
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Webster’s Revised Unabridged Dictionary · 1913

Demoniac

De·mo′ni·ac (dē·mō′nĭ·ăk), Dem′o·ni′a·cal, 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.

De·mo′ni·ac (dē·mō′nĭ·ăk), 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.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article; Greek words our source left out (shown as “?”), read from the 1898 printing, from the same plates (the Library of Congress’s copy), where the place could be found with certainty.