ignis fatuus


Concise Oxford English Dictionary © 2008 Oxford University Press:
ignis fatuus /ˌɪgnɪs ˈfatjʊəs/
noun (pl. ignes fatui /ˌɪgniːz ˈfatjʊʌɪ, ˌɪgneɪz, ˈfatjʊiː/) a will-o'-the-wisp.
– origin C16: mod. L., lit. ‘foolish fire’ (because of its erratic movement).
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