Medical Definition of Black-jack
1.
1. A name given by English miners to sphalerite, or zinc blende; called also false galena. See Blende.
2. Caramel or burnt sugar, used to colour wines, spirits, ground coffee, etc.
3. A large leather vessel for beer, etc.
4. The Quercus nigra, or barren oak.
5. The ensign of a pirate.
Source: Websters Dictionary
(01 Mar 1998)
Lexicographical Neighbors of Black-jack
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