jack-o'-lantern Syllabification: (jack-o'-lan·tern)Pronunciation: /ˈjak ə ˌlantərn/Definition of jack-o'-lantern noun 1a lantern made from a hollowed-out pumpkin in which holes are cut to represent facial features, typically made at Halloween. 2 archaic an ignis fatuus. jack-o'-lantern in other Oxford dictionaries Definition of jack-o'-lantern in the British & World English dictionary
