/ Dictionary / Index I incubus: Meaning and Definition of Find definitions for: in•cu•bus Pronunciation: (in'kyu-bus, ing'-), [key] — pl. -bi -bus•es. an imaginary demon or evil spirit supposed to descend upon sleeping persons, esp. one fabled to have sexual intercourse with women during their sleep. Cf. succubus (def. 1). a nightmare. something that weighs upon or oppresses one like a nightmare. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: incubus (Thesaurus) incubous incudes Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language