incubus - Dictionary definition and pronunciation - Yahoo! Education
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in·cu·bus  audio  (nky-bs, ng-) KEY 

NOUN:
pl. in·cu·bus·es or in·cu·bi  (-b) KEY 
  1. An evil spirit supposed to descend upon and have sexual intercourse with women as they sleep.
  2. A nightmare.
  3. An oppressive or nightmarish burden.
ETYMOLOGY:
Middle English, from Late Latin, alteration of Latin incub, from incubre, to lie down on ; see incubate


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