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Definition of: BLACKJACK

black-jack
(n.) A name given by English miners to sphalerite, or zinc blende; -- called also false galena. See Blende.
(n.) Caramel or burnt sugar, used to color wines, spirits, ground coffee, etc.
(n.) A large leather vessel for beer, etc.
(n.) The Quercus nigra, or barren oak.
(n.) The ensign of a pirate.
(n.) Card game in which players attempt to aquire cards with a face value totalling 21 and no more.