Jack-o'-lantern
Pronunciation : Jack"-o'-lan`tern
Part of Speech : n.
Definition : Defn: See Jack-with-a-lantern, under 2d Jack. JACKPOT Jackpot
Defn: 1. (a) See "jack pot" under jack; (b) any larger-than-usual gambling prize formed by the accumulation of unwon bets[=MW10 1(a)(2) and 1(c)]; (c) the highest gambling prize awarded in a gambling game in which smaller prizes are also awarded, especially such a prize on a slot machine.
Defn: 2. (a) An unusually large success in an enterprise, either unexpected or unpredictable, esp. one providing a great financial benefit. hit the jackpotto receive an unexpectedly large (or the largest possible) benefit from an enterprise.
Source : Webster's Unabridged Dictionary, 1913