blackjack
n. uncountablen. a popular card game played in casinos where you try to get a total of 21 points. You win if your hand is higher than the dealer's without going over the limit.
n. a gambling card game in which players attempt to acquire cards with a face value totalling 21, or as close to 21 as possible without exceeding it. Often played against a dealer rather than other players.
He won a hundred dollars playing blackjack at the casino.
The dealer shuffled the deck and dealt two cards to every player at the blackjack table.
Professional gamblers often employ basic strategy to minimize the house edge in blackjack, though casinos remain vigilant against those who attempt to track the deck through card counting.
From black + jack.
Uncountable when referring to the game itself; countable when referring to a hand of cards totalling 21.