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.) 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.