Definitions from Wiktionary (black-jack)

▸ noun:  (uncountable, obsolete, mineralogy, UK) Sphalerite; zincblende.
▸ noun:  (uncountable, obsolete) Caramel or burnt sugar, used to colour wines, spirits, ground coffee, etc.
▸ noun:  (obsolete) A large leather vessel for beer, etc.
▸ noun:  (obsolete) A water oak or barren oak (Quercus nigra).
▸ noun:  (obsolete, circa 1700s) A native African longshoreman or sailor working on a boat.
▸ noun:  A coalfish (Pollachius virens).
▸ noun:  A larva of a sawfly of species Athalia rosae (syns. Athalia centifolia, A. spinarum).

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