Succubus
Pronunciation : Suc"cu*bus
Part of Speech : n.;
Etymology : [See Succuba.]
Definition : 1. A demon or fiend; especially, a lascivious spirit supposed to have sexual intercourse with the men by night; a succuba. Cf. Incubus.
2. (Med.)
Defn: The nightmare. See Nightmare, 2.
pl. Succubi.
Source : Webster's Unabridged Dictionary, 1913