Webster's English Dictionary

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incubus

Cross references:
  1. succubus              
 
in.cu.bus \'in-ky*-b*s, 'in-\ \-.bi--, -.be-\ n or in.cu.bi also 
   in.cu.bus.es [ME, fr. LL, fr. L incubare] pl  1: an evil spirit supposed to 
   lie upon persons in their sleep and esp. to h ave sexual intercourse with 
   women by night 2: NIGHTMARE  3: a person or thing that oppresses or burdens 
   like a nightmare