ignis fatuus

ignis fatuus

< /ˈɪg niz ˈfætʃ uˌaɪ/.

  1. Also called friar’s lantern, will-o’-the-wisp. a flitting phosphorescent light seen at night, chiefly over marshy ground, and believed to be due to spontaneous combustion of gas from decomposed organic matter.
  2. something deluding or misleading.

noun plural ignes fatui (ˈɪɡniːz ˈfætjʊˌaɪ)

  1. another name for will-o’-the-wisp

“will o’ the wisp, jack-a-lantern,” 1560s, from Medieval Latin, literally “foolish fire;” see igneous + fatuous.

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