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Noun: ignis fatuus (ignis fatui)  'ig-nus'fa-choo-us
  1. A pale light sometimes seen at night over marshy ground
    - friar's lantern, jack-o'-lantern, will-o'-the-wisp
  2. An illusion that misleads
    - will-o'-the-wisp

Type of: fancy, fantasy, illusion, light, phantasy [archaic], visible light, visible radiation

Encyclopedia: Ignis fatuus