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Meaning of jack-o'-lantern

jack-o'-lan•tern

Pronunciation: ( jak'u-lan"turn), [key]
— n.
  1. a hollowed pumpkin with openings cut to represent human eyes, nose, and mouth and in which a candle or other light may be placed, traditionally made for display at Halloween.
  2. a commercially made lantern resembling this.
  3. any phenomenon of light, as a corona discharge or an ignis fatuus.
  4. a poisonous luminescent orange fungus, Omphalotus olearius, often found in clusters at the base of hardwood tree stumps.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.