Definition of ignis fatuus in English:

ignis fatuus

noun

  • A will-o'-the-wisp.

    • ‘How is the gas of ignis fatui ignited on bogs and meadows?’
    • ‘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.’
    mirage, hallucination, apparition, phantasm, phantom, vision, spectre, fantasy, figment of the imagination, will-o'-the-wisp, trick of the light
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Origin

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

Pronunciation:

ignis fatuus

/ˌɪɡnɪs ˈfatjʊəs/