Definition of: blackjack

(blak′jak′) noun
1. A small bludgeon with a flexible handle.
2. A black flag; a pirate's ensign.
3. A small oak (Quercus marilandica) of the SE United States.
4. Vingt-et-un: a card game.
5. A drinking can, formerly of leather, now of japanned metal.
6. Sphalerite or zincblende.
7. Caramel: used to color soups, wines, etc.
—v.t.
1. To strike with a blackjack.
2. To coerce by threat.
BLACKJACK (def. 2)