jack-o'-lantern

noun3

1. •
   A carved pumpkin whose top and stem have been cut out and interior removed, leaving a hollow shell that is then decorated to represent a face, illuminated from within by a candle. It is a symbol of Halloween.

   • He had a jocose jack-o'-lantern grin, big crooked nicotine-stained teeth, and a full droopy dark moustache and wiry whiskers hiding a weak chin. (attributive use) — 2001
2. •
   A similar item made from a turnip.
3. •
   (no longer used) A will o' the wisp.

   • [Newspaper speculations] supplying so many more jack-o'-lanterns to the future historian — 1871