Medical term:

incubus



in·cu·bus

(in'kū-bŭs),
Originally, an evil spirit that would lie on and oppress sleeping people; especially, a male spirit that copulated with sleeping women. Compare: succubus.
[L. fr. incubo, to lie on]
Farlex Partner Medical Dictionary © Farlex 2012

incubus

(1) An evil (male) spirit that copulates with sleeping women. 
(2) An erotic nightmare occurring in a sexually repressed female.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

in·cu·bus

(in'kyū-bŭs)
1. Originally, an evil spirit that lay on and oppressed sleeping people, especially, a male spirit that copulated with sleeping women.
Compare: succubus
2. Synonym(s): nightmare.
[L. fr. incubo, to lie on]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

incubus

(ĭn′kū-bŭs) [L. incubare, to lie upon]
A nightmare.
Medical Dictionary, © 2009 Farlex and Partners


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