will-o'-the-wisp(redirected from Fool's fire)
Also found in: Dictionary, Thesaurus, Medical.
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.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/