Definition of ignis fatuus in English:

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ignis fatuus

Pronunciation: /ˌiɡnəs ˈfaCHəwəs/

noun (plural ignes fatui /ˈiɡnēz ˈfaCHo͞oˌī/)

1A will-o'-the-wisp.
Example sentences
  • But it's impossible to describe these paintings, also because they hit your soul like burning arrows and recall the sad and reddish dance of the ignis fatuuses.
  • How is the gas of ignis fatui ignited on bogs and meadows?
1.1Something deceptive or deluding.
Example sentences
  • He chases so many ignes fatui that his thinking becomes fatuous.


Mid 16th century: modern Latin, literally 'foolish fire' (because of its erratic movement).

For editors and proofreaders

Syllabification: ig·nis fat·u·us

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