Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
jack-a-lantern is a noun meaning "a large poisonous agaric with orange caps and narrow clustered stalks; the gills are luminescent". It carries one recorded sense.
a large poisonous agaric with orange caps and narrow clustered stalks; the gills are luminescent
Definitions, synonyms and semantic relations for jack-a-lantern come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.