Definitions of black-jack:
- noun: (obsolete, mineralogy, UK) Sphalerite; zincblende.
- noun: (obsolete) Caramel or burnt sugar, used to colour wines, spirits, ground coffee, etc.
- noun: (obsolete) A large leather vessel for beer, etc.
- noun: (obsolete) The Quercus nigra, water oak or barren oak.
- noun: (obsolete, circa 1700s) A native African longshoreman or sailor working on a boat.
(Definitions from Wiktionary)
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