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Answers.com - Incubus
From SuccuWiki - The Wiki of the Succubi
incubus (ĭn'kyə-bəs, ĭng'-) pronunciation
n., pl. -bus·es or -bi (-bī').
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.
(Middle English, from Late Latin, alteration of Latin incubō, from incubāre, to lie down on.)

