Black-jack

·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.