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A jack-o'-lantern (or jack o'lantern) is a carved pumpkin, or turnip, and named after the phenomenon of strange light flickering over peat bogs in Ireland, called will-o'-the-wisp or jack-o'-lantern. Originally, the jack-o'-lantern was a carved turnip. When the Irish immigrants came to America in the mid-1800's, turnips were not commonly available and pumpkins were more accessible and much easier to carve out.