Ignis fatuus

Webster's Dictionary of the English Language

·- Fig.: A misleading influence; a decoy.

II. Ignis fatuus ·- 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.

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