Our online medical glossary of medical terms and definitions includes definitions for terms related to treatment, and general medicine
BLACK-JACK
1. A name given by English miners to sphalerite, or zinc blende; called alsofalse galena. See Blende.
2. Caramel or burnt sugar, used to colour wines, spirits, ground coffee, etc.
3. A bigleathervessel for beer, etc.
4. The Quercus nigra, or barren oak.
5. The ensign of a pirate.
Source: Websters Vocabulary