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incubus (ĭngˈkyo͝obəs), lascivious male demon said to possess mortal women as they sleep and to be responsible for the birth of demons, witches, and deformed children. According to one legend the incubus and his female counterpart, the succubus, were fallen angels. The belief in these demons was especially prevalent in the Middle Ages, and stories of assaults by incubi were not uncommon. There are similar spirits in many cultures. In current usage, incubus means a person or thing that oppresses, such as a nightmare.
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demon in the form of a man. [Western Folklore: Briggs, 232]
Allusions—Cultural, Literary, Biblical, and Historical: A Thematic Dictionary. Copyright 2008 The Gale Group, Inc. All rights reserved.
a demon believed in folklore to lie upon sleeping persons, esp to have sexual intercourse with sleeping women
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005