IGNIS FATUUS Meaning of IGNIS FATUUS in English transcription, транскрипция: [ ˈɪɡnɪsˈfætjuəs ]n. (pl. ignes fatui) a will-o'-the-wisp. [mod.L, = foolish fire, because of its erratic movement] English main colloquial, spoken dictionary. Английский основной разговорный словарь. 2012