Definition of incubus noun from the Oxford Advanced Learner's Dictionary

     

    incubus

     noun
    noun
    BrE BrE//ˈɪŋkjʊbəs//
     
    ; NAmE NAmE//ˈɪŋkjʊbəs//
     
    (pl. incubuses, incubi
    BrE BrE//ˈɪŋkjʊbaɪ//
     
    ; NAmE NAmE//ˈɪŋkjʊbaɪ//
     
    )
     
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  1. 1(literary) a problem that makes you worry a lot
  2. 2 a male evil spirit, supposed in the past to have sex with a sleeping woman compare succubus
  3. Word Origin Middle English: late Latin form of Latin incubo ‘nightmare’, from incubare ‘lie on’, from in- ‘upon’ + cubare ‘to lie’.
See the Oxford Advanced American Dictionary entry: incubus