/suk"yeuh beuhs/ , n. , pl. succubi /-buy'/ .
1. a demon in female form, said to have sexual intercourse with men in their sleep. Cf. incubus (def. 1).
2. any demon or evil spirit.
3. a strumpet or prostitute.
[ 1350-1400; ME succuba SUCCUBA; cf. INCUBUS ]