Will-o'-the-wisp

n.

1.

See Ignis fatuus.

Noun	1.	will-o'-the-wisp - a pale light sometimes seen at night over marshy ground Synonyms: friar's lantern, ignis fatuus, jack-o'-lantern
	2.	will-o'-the-wisp - an illusion that misleads Synonyms: ignis fatuus

friar's lantern, ignis fatuus, jack-o'-lantern, light, visible light, visible radiation