Definition of "black-jack" []

• Sphalerite; zincblende. (noun)
• Caramel or burnt sugar, used to colour wines, spirits, ground coffee, etc. (noun)
• A large leather vessel for beer, etc. (noun)
• The Quercus nigra, or barren oak. (noun)

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• "Even John McCain, whom the New York Times has documented is an inveterate casino gambler, can't do that well at the black-jack table."
• "How does a moderate Democrat survive in Oklahoma, where there is a right-wing Republican around every rock and black-jack tree in the state?"
• "The first hand of black-jack played by a 22-year-old kid from Nebraska in Vegas may feel 175% game like... but to the withered, 71-year-old dealer who's been slinging cards for 18 hours straight... is it a game?"