suc·cu·bus (sŭk'yə-bəs) n.
pl.suc·cu·bus·es or suc·cu·bi (-bī', -bē') also suc·cu·bae (-bē', -bī')
A female demon supposed to descend upon and have sexual intercourse with a man while he sleeps.
An evil spirit; a demon.
[Middle English, from Medieval Latin, alteration (influenced by Late Latin incubus, incubus) of Latin succuba, paramour, from succubāre, to lie under : sub-, sub- + cubāre, to lie down.]
1387, alteration (after incubus) of L.L. succuba "strumpet," applied to a fiend in female form having intercourse with men in their sleep, from succubare "to lie under," from sub- "under" + cubare "to lie down" (see cubicle).
Main Entry: suc·cu·bus Pronunciation: 's&k-y&-b&s Function: noun Inflected Form: pluralsuc·cu·bi/-"bI,-"bE/ : an imaginary demon assuming female form and formerly held to have sexual intercourse with men in their sleep —compare INCUBUS 1