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incubus

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(in′kyə bəs, iŋ′-)

noun pl. incubuses or incubi

an evil spirit or demon thought in medieval times to descend upon and have sexual intercourse with women
a nightmare
anything oppressive; burden

Origin: ME < LL, nightmare (in ML, demon supposed to cause nightmares) < L incubare: see incubate

See incubus in American Heritage Dictionary 4

noun pl. in·cu·bus·es or in·cu·bi (-bīˌ)

An evil spirit supposed to descend upon and have sexual intercourse with women as they sleep.
A nightmare.
An oppressive or nightmarish burden.

Origin:

Origin: Middle English

Origin: , from Late Latin

Origin: , alteration of Latin incubō

Origin: , from incubāre, to lie down on; see incubate

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