blackjack

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blackjack,

one of the world's most widely played gambling card games; also known as twenty-one or vingt-et-un. Despite contesting claims between the French and Italians, its origins are unknown. Each player receives one card face down and bets that this card plus additional cards dealt face up will beat the dealer's hand without exceeding 21. An ace counts one or eleven, a face card ten, and all others cards according to their face value. A score of 21 on the first two cards is called blackjack.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/

blackjack

1 Cards
1. pontoon or any of various similar card games
2. the ace of spades

blackjack

2
a dark iron-rich variety of the mineral sphalerite

blackjack

3
a small oak tree, Quercus marilandica, of the southeastern US, with blackish bark and fan-shaped leaves
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
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A blackjack, or a sap, can be generally described as a leather pouch filled with lead shot at the end of a length of coiled spring and used as a short club.