Pronunciation: /ˌɪɡnɪs ˈfætʃuəs/
noun a phosphorescent light that hovers or flits over swampy ground at night, possibly caused by the combustion of gases from decomposed organic matter
A1 I saw an ignis fatuus in the distance while camping.
A2 Local legend says that the ignis fatuus leads travelers astray in the marshes.
B1 Some people mistake the ignis fatuus for a ghostly apparition.
B2 Scientists have studied the ignis fatuus phenomenon to understand its causes.
C1 The ignis fatuus has been a source of mystery and intrigue for centuries.
C2 Many poets and writers have used the ignis fatuus as a symbol of illusion and deceit in their works.
formal The ignis fatuus is a natural phenomenon that can sometimes be mistaken for a ghostly light in the distance.
informal I thought I saw an ignis fatuus while walking in the woods last night, but it turned out to be just a reflection.
slang Don't be fooled by that ignis fatuus, it's just a trick of the light.
figurative His promises were like an ignis fatuus, leading me on but never delivering.
ignes fatui
more ignis fatuus
most ignis fatuus
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has been ignis fatuus
is being ignis fatuus
ignis fatuus
ignis fatuus
to be ignis fatuus
ignis fatuus-ing
ignis fatuus-ed