/ ˈsʌkjʊbəs; NAmE / noun
( pl. suc·cu·bi / -baɪ; NAmE /) ( literary ) a female evil spirit, supposed to have sex with a sleeping man
—compare incubus
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WORD ORIGIN
late Middle English : from medieval Latin succubus prostitute, from succubare , from sub- under + cubare to lie.