jack-o'-lantern

[ jak-uh-lan-tern ]
/ ˈdʒæk əˌlæn tərn /

noun

a hollowed pumpkin with openings cut to represent human eyes, nose, and mouth and in which a candle or other light may be placed, traditionally made for display at Halloween.
a commercially made lantern resembling this.
any phenomenon of light, as a corona discharge or an ignis fatuus.
a poisonous luminescent orange fungus, Omphalotus olearius, often found in clusters at the base of hardwood tree stumps.

Origin of jack-o'-lantern

First recorded in 1655–65

British Dictionary definitions for jack-o'-lantern

jack-o'-lantern

noun

a lantern made from a hollowed pumpkin, which has holes cut in it to represent a human face
a will-o'-the-wisp or similar phenomenon