ignis fatuus

noun
ig·​nis fat·​u·​us | \ˈig-nəs-ˈfa-chə-wəs, -ˈfach-wəs\
plural ignes fatui\ˈig-​ˌnēz-​ˈfa-​chə-​ˌwī \

Definition of ignis fatuus 

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

First Known Use of ignis fatuus

1563, in the meaning defined at sense 1

History and Etymology for ignis fatuus

Medieval Latin, literally, foolish fire

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Dictionary Entries near ignis fatuus

ignescent

igni-

ignimbrite

ignis fatuus

ignite

ignition

ignition charge

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The first known use of ignis fatuus was in 1563

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to make faulty or ineffective

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