will-o'-the-wisp

Primary Meanings of will-o'-the-wisp

1.
n
a pale light sometimes seen at night over marshy ground
2.
n
an illusion that misleads
Full Definitions of will-o'-the-wisp
1

n a pale light sometimes seen at night over marshy ground

Synonyms:
friar's lantern, ignis fatuus, jack-o'-lantern
Type of:
light, visible light, visible radiation
(physics) electromagnetic radiation that can produce a visual sensation
2

n an illusion that misleads

Synonyms:
ignis fatuus
Type of:
fancy, fantasy, illusion, phantasy
something many people believe that is false

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