Pumpkin, Jack o' Lantern

The term jack-o'-lantern was originally used to describe the visual phenomenon ignis fatuus (lit., "foolish fire") known as a will-o'-the-wisp in English folklore. Used especially in East England, its earliest known use dates to the 1660s. The Oxford English Dictionary (OED) records use of the term in Britain from 1658 in reference to ignis fatuus, and from 1663 to 1704 in reference to a man with a lantern or to a night watchman. The OED gives 1837 as the earliest date for when the term was used to refer to a lantern carved from a turnip or pumpkin.