ignis fatuus

Noun	1.	ignis fatuus - a pale light sometimes seen at night over marshy ground friar's lantern, jack-o'-lantern, will-o'-the-wisp light, visible light, visible radiation - (physics) electromagnetic radiation that can produce a visual sensation; "the light was filtered through a soft glass window"
	2.	ignis fatuus - an illusion that misleads will-o'-the-wisp fancy, phantasy, illusion, fantasy - something many people believe that is false; "they have the illusion that I am very wealthy"

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