will-o'-the-wisp

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will-o'-the-wisp,

phenomenon known also as ignis fatuus and jack-o'-lantern. It is seen at night as a pale, flickering light over marshland. There is no generally accepted explanation for it; it may result from the spontaneous ignition of gases (e.g., methane) produced by the disintegration of dead plant or animal matter, or it may be a form of phosphorescence. The eerie lights have given rise to many superstitions.
References in periodicals archive ?
There are even stories of the Corpse Candle emerging from a sleeping person's mouth before heading to the burial ground -and then it was known that that person would soon be sleeping his final sleep