ignis fatuus
/ˈɪɡnɪs ˈfætjuːəs/ noun
Forms ignes fatui
Synonyms
Etymology
From New Latin ignis fatuus (literally “foolish fire”).
Webster’s 1913
- A phosphorescent light that appears, in the night, over marshy ground, supposed to be occasioned by the decomposition of animal or vegetable substances, or by some inflammable gas; --popularly called also Will-with-the-wisp, or Will-o'-the-wisp, and Jack-with-a-lantern, or Jack-o'-lantern.
- Fig.: A misleading influence; a decoy.
Etymology [L. ignis fire + fatuus foolish. So called in allusion to its tendency to mislead travelers.]
Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “ignis fatuus”, CC BY-SA 4.0. Details