incubus

  1. Noun.  An evil spirit supposed to oppress people while asleep, especially to have sex with women as they sleep.
  2. Noun.  A feeling of oppression during sleep; night terrors, a nightmare.
  3. Noun.  Any oppressive thing or person; a burden.
  4. Noun.  One of a genus of parasitic insects.

This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license. Wiktionary is a great resource. If you like it too, please donate to Wikimedia.

This entry was last updated on RefTopia from its source on 3/20/2012.