Definition of
ignis_fatuus has definitions from the field of physics
1
[ noun ] (physics) a pale light sometimes seen at night over marshy ground

Synonyms

jack-o'-lantern will-o'-the-wisp friar's_lantern

Related terms

light

2
[ noun ] an illusion that misleads

Synonyms

will-o'-the-wisp

Related terms

illusion

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