• jack-o'-lantern •
jæk-ê-læn-têrn • Hear it!
Part of Speech: Noun
Notes: No, the symbol of Halloween in North America does not come from an Irishman by the name of Jack O'Lantern, though many a fetching story claims otherwise. It is the reduction of an old phrase, "jack with a lantern," worded and spelled in an old fashioned way. It is currently used as a single noun, so the plural is jack-o'-lanterns.
In Play: The custom of putting carved vegetables out on Halloween did, however, originate with Irish Catholics. The Irish once placed carved turnips and rutabagas containing candles in their windows to ward off the dead souls they presumed wandered about on the eve of All Saints Day, originally known as All Hallow Even(ing), today simplified to Hallowe'en or just Halloween. The Irish switched to pumpkins when they immigrated to America since turnips and rutabagas were more likely to be served for dinner.
Word History: Jack-with-a-lantern originally meant simply "man with a lantern" (jack, as in the phrase, "every man, jack of them"). It referred to a night watchman. Its later structure, jack-o'-lantern, is analogical with that of will-o'-the-wisp, which originally meant only "a man named Will with a wisp (whiskbroom)". Both will-o'-the-wisp and jack-o'-lantern were later used to refer to what the Romans called ignis fatuus "crazy fire", the pale, mysterious fire from gas that sometimes faintly burns over marshy areas. A will-o'-the-wisp was then taken to be a sprite carrying the wisp of a torch across the swamps. A jack-o'-lantern was assumed to be a man with a lantern engaged in the same activity.