incubus

noun in·cu·bus \ˈiŋ-kyə-bəs, ˈin-\

plural in·cu·bi \-ˌbī, -ˌbē\ also in·cu·bus·es

Medical Definition of INCUBUS

: 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

: nightmare

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