black-jack Meaning, Definition & Usage

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

Webster 1913