black-jack

CIDE DICTIONARY

black-jack, n. 

•  A name given by English miners to sphalerite, or zinc blende; -- called also false galena. See Blende.  [1913 Webster]
•  Caramel or burnt sugar, used to color wines, spirits, ground coffee, etc.  [1913 Webster]
•  A large leather vessel for beer, etc.  [1913 Webster]
•  The Quercus nigra, or barren oak.  [1913 Webster]
•  The ensign of a pirate.  [1913 Webster]