in·cu·bus

[in-kyuh-buhs, ing-]
noun, plural in·cu·bi [-bahy] , in·cu·bus·es.
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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Incubi is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
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World English Dictionary
incubus (ˈɪnkjʊbəs) [Click for IPA pronunciation guide]
 
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
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences from the web
In folklore it is considered to ward off vampires, incubi, succubi, and other evils.
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