Corpse candle

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A thick candle formerly used at a lich wake, or the customary watching with a corpse on the night before its interment. (b) A luminous appearance, resembling the flame of a candle, sometimes seen in churchyards and other damp places, superstitiously regarded as portending death.

See also: Corpse

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in classic literature ?
I had heard of corpse candles, and at last I persuaded myself that this must be a corpse bell tolling of itself at midnight for the dead.
Some of the unique Welsh characters to be avoided on this night include Yr Hwch Ddu Gwta, the tailless black sow who is accompanied by a headless white lady, and Jack y Lantern, the Welsh jack-o'-lantern, a "dreaded ghost" which lit up the dark forests at night like a corpse candle.
in its place a corpse candle, a bit of reflected light?