black-jack
Noun

black-jack

  1. (obsolete, mineral, UK) Sphalerite; zincblende.
  2. (obsolete) Caramel or burnt sugar, used to colour wines, spirits, ground coffee, etc.
  3. (obsolete) A large leather vessel for beer, etc.
  4. (obsolete) The Quercus nigra, water oak or barren oak.
  5. (obsolete, circa 1700s) A native African longshoreman or sailor working on a boat.



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