black-jack

Black"-jack`, n. 1. (Min.) Defn: 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.) Defn: The Quercus nigra, or barren oak. 5. The ensign of a pirate.

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