D defs.my
Entry 3 senses Webster, 1913

Incubus

· In·cu·bus · IPA /ˈɪŋ.kjʊ.bəs/
01 n. A demon; a fiend; a lascivious spirit, supposed to have sexual intercourse with women by night.
pl. Incubuses, Incubi ((#))
  1. 1.
    A demon; a fiend; a lascivious spirit, supposed to have sexual intercourse with women by night.
    “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. 2.
    The nightmare. See Nightmare.(Med.) See: Nightmare
    “Such as are troubled with incubus, or witch-ridden, as we call it.” — Burton.
  3. 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.