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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Black-jack, n.
 1. Min. A name given by English miners to sphalerite, or zinc blende; -- called also false galena. See Blende.
 2. Caramel or burnt sugar, used to color wines, spirits, ground coffee, etc.
 3. A large leather vessel for beer, etc. [Obs.]
 4. Bot. The Quercus nigra, or barren oak.
 5. The ensign of a pirate.
 

From: WordNet (r) 2.0

 blackjack
      n 1: a common scrubby deciduous tree of central and southeastern
           United States having dark bark and broad 3-lobed
           (club-shaped) leaves; tends to form dense thickets [syn:
            blackjack oak, jack oak, Quercus marilandica]
      2: a piece of metal covered by leather with a flexible handle;
         used for hitting people [syn: cosh, sap]
      3: a gambling game using cards; the object is to hold cards
         having a higher count than those dealt to the bank up to
         but not exceeding 21 [syn: twenty-one, vingt-et-un]
      v : exert pressure on someone through threats [syn: blackmail,
           pressure]