Ignis-fatuus



[ig-nis fach-oo-uh s] /ˈɪg nɪs ˈfætʃ u əs/

noun, plural ignes fatui
[ig-neez fach-oo-ahy] /ˈɪg niz ˈfætʃ uˌaɪ/ (Show IPA)
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.
/ˈɪɡnɪs ˈfætjʊəs/
noun (pl) ignes fatui (ˈɪɡniːz ˈfætjʊˌaɪ)
1.
another name for will-o’-the-wisp
n.

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

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