Portuguese Etymology Calque of Latin ignis fatuus. Pronunciation (Brazil) IPA(key): /ˌfo.ɡuˈfa.tu.u/ [ˌfo.ɡuˈfa.tʊ.u], (faster pronunciation) /ˌfo.ɡuˈfa.twu/ (Brazil) IPA(key): /ˌfo.ɡuˈfa.tu.u/ [ˌfo.ɡuˈfa.tʊ.u], (faster pronunciation) /ˌfo.ɡuˈfa.twu/ (Southern Brazil) IPA(key): /ˌfo.ɡoˈfa.tu.o/ [ˌfo.ɡoˈfa.tʊ.o], (faster pronunciation) /ˌfo.ɡoˈfa.two/ (Portugal) IPA(key): /ˌfo.ɡuˈfa.twu/ [ˌfo.ɣuˈfa.twu] Hyphenation: fo‧go‧fá‧tu‧o Noun fogo-fátuo m (plural fogos-fátuos) (folklore) will o' the wisp (strange ball of light) Synonyms: fogo corredor, João GalafoiceWikiwand - on Seamless Wikipedia browsing. On steroids.