incubus

noun
in·cu·bus | \ ˈiŋ-kyə-bəs , ˈin- \
plural incubi\ˈiŋ-kyə-ˌbī, -ˌbē, ˈin- \ also incubuses

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

3 : one that oppresses or burdens like a nightmare

First Known Use of incubus

13th century, in the meaning defined at sense 1

History and Etymology for incubus

Middle English, from Late Latin, from Latin incubare

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The first known use of incubus was in the 13th century

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incubus

noun
in·cu·bus | \ ˈiŋ-kyə-bəs, ˈin- \
plural incubi\-ˌbī, -ˌbē \ also incubuses

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 : nightmare

More from Merriam-Webster on incubus

Britannica.com: Encyclopedia article about incubus

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