Black-jack

1. n. The ensign of a pirate.
2. n. A name given by English miners to sphalerite, or zinc blende; — called also false galena. See Blende.
3. n. Caramel or burnt sugar, used to color wines, spirits, ground coffee, etc.
4. n. A large leather vessel for beer, etc.
5. n. The Quercus nigra, or barren oak.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.