Definition of ignis fatuus
ignes fatui
play \ˈig-ˌnēz-ˈfa-chə-ˌwī\1 : a light that sometimes appears in the night over marshy ground and is often attributable to the combustion of gas from decomposed organic matter
2 : a deceptive goal or hope
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Origin and Etymology of ignis fatuus
Medieval Latin, literally, foolish fire
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