Dictionary![]() ![]() in•cu•busPronunciation: (in'kyu-bus, ing'-), [key] —n., —pl. -biPronunciation: (-bī"), [key] -bus•es. 1. 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). 2. a nightmare. 3. something that weighs upon or oppresses one like a nightmare. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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