ignis-fatuus

ig·nis fat·u·us

[ig-nis fach-oo-uhs]
noun, plural ig·nes fat·u·i [ig-neez fach-oo-ahy] .
1.
Also called friar's lantern, will-o'-the-wisp. a flitting phosphorescent light seen at night, chiefly over marshy ground, and believed to be due to spontaneous combustion of gas from decomposed organic matter.
2.
something deluding or misleading.

Origin:
1555–65; < Medieval Latin: literally, foolish fire

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World English Dictionary
ignis fatuus (ˈɪɡnɪs ˈfætjʊəs) [Click for IPA pronunciation guide]
 
n , pl ignes fatui
another name for will-o'-the-wisp
 
[C16: from Medieval Latin, literally: foolish fire]

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Ignis-fatuus is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Etymonline
Word Origin & History

ignis fatuus
"will o' the wisp, jack-a-lantern," 1563, from M.L., lit. "foolish fire." It seems once to have been more common than presently.
Online Etymology Dictionary, © 2010 Douglas Harper
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