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jack-o'-lan•tern(ˈdʒæk əˌlæn tərn)
1. a hollowed pumpkin with openings cut to represent a human face, traditionally displayed at Halloween, often with a candle or other light inside.
2. any phenomenon of light, as a corona discharge or an ignis fatuus.
3. a poisonous luminescent orange fungus, Omphalotus olearius, that grows in clusters at the base of tree stumps.
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|Noun||1.||jack-o-lantern - a large poisonous agaric with orange caps and narrow clustered stalks; the gills are luminescent|
agaric - a saprophytic fungus of the order Agaricales having an umbrellalike cap with gills on the underside