from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Pertaining to, characteristic of, or produced by a demon or evil spirit; devilish or fiendish.
from The Century Dictionary and Cyclopedia
- Of demoniac character or origin; like a demon; demoniac.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. frenzied as if possessed by a demon
Sorry, no etymologies found.
With the next breath it shrieks in demoniacal fury, "We must have a victim for the sacrifice, and you shall pay! pay! pay!"
-- The word rendered "devils," is always used for those spiritual agents employed in demoniacal possessions -- never for the ordinary agency of Satan in rational men.
Fed by this stream of thought, and developed in the warm atmosphere of medieval devotion, the idea of demoniacal possession as the main source of lunacy grew and blossomed and bore fruit in noxious luxuriance.
Till this moment the idea of demoniacal interference in my undertaking had not occurred to me.
Not only at the time of Christ's appearance, but also in the centuries immediately following,  many forms of disease like those called demoniacal in the New Testament were spread abroad; and we may infer that the same cause was at work in both periods.
 Christ here indicates that the so-called demoniacal possessions were nothing else but individual phenomena of Satan's kingdom manifested among men.
In those same days, also, the newsman brought to us daily accounts of a regularly accepted and received system of loading the unfortunate insane with chains, littering them down on straw, starving them on bread and water, damaging their clothes, and making periodical exhibitions of them at a small charge; and that on a Sunday one of our public resorts was a kind of demoniacal zoological gardens.
Hecker states, "The swarms of St. John’s dancers were accompanied by minstrels playing those noisy instruments which roused their morbid feelings; moreover, by means of intoxicating music, a kind of demoniacal festival for the rude multitude was established, which had the effect of spreading this unhappy malady wider and wider.
It would frame WikiLeaks as a terrorist operation, or cast the WikiLeaks leader, Julian Assange, as a demoniacal madman, the successor of Saddam Hussein.
Brown's and McTavish's Winchesters -- all against a background of demoniacal screeching and yelling.