- of, relating to, or like a demon; demonic: demoniac laughter.
- possessed by or as by an evil spirit; raging; frantic.
- a person seemingly possessed by a demon or evil spirit.
Origin of demoniac
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for demoniac
It was with the greatest difficulty that I was delivered from the clutches of this demoniac.My Double Life
Martha Brossier, daughter of a weaver at Romorantin, was shown as a demoniac, in 1578.The Phantom World
But the path of these demoniac men was marked by the ravages of fiends.Ferdinand De Soto, The Discoverer of the Mississippi
John S. C. Abbott
It looked a demoniac place, a smoke-wreathed platform in some Inferno circle.
A great, black, cylindrical shell came with a demoniac shriek.
- of, like, or suggestive of a demon; demonic
- suggesting inner possession or inspirationthe demoniac fire of genius
- frantic; frenzied; feverishdemoniac activity
- a person possessed by an evil spirit or demon
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for demoniac
c.1400, "possessed, insane," earlier (late 14c.) as a noun, "one who is possessed," from Late Latin daemoniacus (c.200), from Greek daimoniakos "possessed by a demon," from diamon (see demon).
Online Etymology Dictionary, © 2010 Douglas Harper