Webster's English Dictionary

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succubus

Cross references:
  1. incubus               
 
suc.cu.bus \-b*s\ \-.bi-, -.be-\ n or suc.cu.bi [ME, fr. ML, alter. of LL 
   succuba prostitute, fr. L succubare to li] pl e under, fr. sub- + cubare to 
   lie, recline - more at HIP : a demon assuming female form to have sexual 
   intercourse with men in thei r sleep