Black-jack
Black-jack , noun
1.
(Mineralogy) 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. [Obsolete]
4.
(Botany) The Quercus nigra, or barren oak.
5.
The ensign of a pirate.