/ Dictionary / Index D demonism: Meaning and Definition of Find definitions for: de•mon•ism Pronunciation: (dē'mu-niz"um), [key] — n. belief in demons. the study of demons; demonology. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: demonism (Thesaurus) demonic demonize Related Content Daily Word Quiz: ounterfeit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language