WordWeight : Weighing the Words

Pronunciation : In"cu*bus, n.; pl. E. Incubuses
Part of Speech : L.
Etymology : [L., the nightmare. Cf. Incubate.]
Definition : 1. A demon; a fiend; a lascivious spirit, supposed to have sexual intercourse with women by night. Tylor. The devils who appeared in the female form were generally called succubi; those who appeared like men incubi, though this distinction was not always preserved. Lecky.

2. (Med.)

Defn: The nightmare. See Nightmare. Such as are troubled with incubus, or witch-ridden, as we call it. Burton.

3. Any oppressive encumbrance or burden; anything that prevents the free use of the faculties. Debt and usury is the incubus which weighs most heavily on the agricultural resources of Turkey. J. L. Farley.

Incubi.
Source : Webster's Unabridged Dictionary, 1913