Noun: jack-a-lantern
- A large poisonous agaric with orange caps and narrow clustered stalks; the gills are luminescent
"The jack-a-lantern glowed faintly in the dark forest";
- jack-o-lantern fungus, jack-o-lantern, Omphalotus illudens
Derived forms: jack-a-lanterns
Type of: agaric
Part of: genus Omphalotus, Omphalotus