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Definition of Will-o'-the-wisp
1. Noun. A pale light sometimes seen at night over marshy ground.
Exact synonyms: Friar's Lantern, Ignis Fatuus, Jack-o'-lantern
Generic synonyms: Light, Visible Light, Visible Radiation
Generic synonyms: Light, Visible Light, Visible Radiation
2. Noun. An illusion that misleads.