·noun The ensign of a pirate.
II. Black-jack ·noun The Quercus nigra, or barren oak.
III. Black-jack ·noun A large leather vessel for beer, ·etc.
IV. Black-jack ·noun Caramel or burnt sugar, used to color wines, spirits, ground coffee, ·etc.
V. Black-jack ·noun A name given by English miners to sphalerite, or zinc blende;
- called also false galena. ·see Blende.