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jack-o-lantern

Definitions of jack-o-lantern
  1. noun
    a large poisonous agaric with orange caps and narrow clustered stalks; the gills are luminescent
    synonyms: Omphalotus illudens, jack-a-lantern, jack-o-lantern fungus
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    type of:
    agaric
    a saprophytic fungus of the order Agaricales having an umbrellalike cap with gills on the underside
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