Dictionary

incubus

incubus

noun in·cu·bus \ˈiŋ-kyə-bəs, ˈin-\
plural in·cu·bi\-ˌbī, -ˌbē\ also in·cu·bus·es

Definition of INCUBUS

1
:  an evil spirit that lies on persons in their sleep; especially :  one that has sexual intercourse with women while they are sleeping — compare succubus
2
:  nightmare 2
3
:  one that oppresses or burdens like a nightmare

Origin of INCUBUS

Middle English, from Late Latin, from Latin incubare
First Known Use: 13th century

incubus

noun in·cu·bus \ˈiŋ-kyə-bəs, ˈin-\   (Medical Dictionary)
plural in·cu·bi \-ˌbī, -ˌbē\ also in·cu·bus·es

Medical Definition of INCUBUS

1
:  an evil spirit at one time thought to lie on persons in their sleep; especially :  one thought to have sexual intercourse with sleeping women—compare succubus
2

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