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In some senses, black-jack is marked as obsolete, UK. Watch for register when choosing this word.
black-jack
noun 5
Definitions
noun
1
Sphalerite; zincblende.
2
Caramel or burnt sugar, used to colour wines, spirits, ground coffee, etc.
3
A large leather vessel for beer, etc.
4
A water oak or barren oak (Quercus nigra).
5
A native African longshoreman or sailor working on a boat.
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