incubus

[in-kyuh-buhs, ing-]
noun, plural incubi [in-kyuh-bahy, ing-] , incubuses.
1.
an imaginary demon or evil spirit supposed to descend upon sleeping persons, especially one fabled to have sexual intercourse with women during their sleep. Compare succubus ( def 1 ).
2.
a nightmare.
3.
something that weighs upon or oppresses one like a nightmare.

Origin:
1175–1225; Middle English < Late Latin: a nightmare induced by such a demon, noun derivative of Latin incubāre to lie upon; see incubate

incubus, succubus.
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World English Dictionary
incubus (ˈɪnkjʊbəs)
 
n , pl -bi, -buses
1.  Compare succubus a demon believed in folklore to lie upon sleeping persons, esp to have sexual intercourse with sleeping women
2.  something that oppresses, worries, or disturbs greatly, esp a nightmare or obsession
 
[C14: from Late Latin, from incubāre to lie upon; see incubate]

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Etymonline
Word Origin & History

incubus
c.1200, from L.L. (Augustine), from L. incubo "nightmare, one who lies down on (the sleeper)," from incubare "to lie upon" (see incubate). Plural is incubi. In the Middle Ages, their existence was recognized by law.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

incubus in·cu·bus (ĭn'kyə-bəs, ĭng'-)
n. pl. in·cu·bus·es or in·cu·bi (-bī')

  1. An evil spirit believed to have sexual intercourse with women as they sleep.

  2. A nightmare.

  3. An oppressive or nightmarish burden.

The American Heritage® Stedman's Medical Dictionary
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Example sentences for incubi
In folklore it is considered to ward off vampires, incubi, succubi, and other evils.
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