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incubus (n.)

"imaginary being or demon, credited with causing nightmares, and, in male form, consorting with women in their sleep," c. 1200, from Late Latin incubus (Augustine), from Latin incubo "nightmare, one who lies down on (the sleeper)," from incubare "to lie upon" (see incubate). Plural is incubi. Compare succubus.

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Definitions of incubus from WordNet

incubus (n.)
a male demon believed to lie on sleeping persons and to have sexual intercourse with sleeping women;
incubus (n.)
a situation resembling a terrifying dream;
Synonyms: nightmare
incubus (n.)
someone who depresses or worries others;
From wordnet.princeton.edu