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incumber
incunable
incunabula
incunabulum
incur
incurable
incurable depreciation
incurious
incurrent
incursion
incurvate
incurve
incus
incuse
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incubus

in·cu·bus [ íngkyəbəss ] (plural in·cu·bi [ íngkyə b ] or in·cu·bus·es)


noun 
Definition:
 
1. cause of mental distress: something that causes somebody much worry or anxiety, especially a nightmare or obsession ( literary )

2. male demon having sex with women: in medieval times, a male demon that was believed to have sexual intercourse with women while they were asleep

[14th century. < late Latin, "nightmare" < Latin incubare (see incubate)]
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