black-jack

from The Century Dictionary.

• noun Candy made of dark molasses.
• noun A capacious drinking-cup or can formerly made of waxed leather, but now of thin metal, the outside being japanned black, except the edge, which is left bright, in imitation of the ancient leathern black-jacks with silver rims.
• noun The ensign of a pirate.
• noun A Cornish miners' term for the common ferruginous zinc sulphid, of which the mineralogical name is sphalerite, and the common name blende. Also called false galena.
• noun Caramel or burnt sugar used for coloring spirits, vinegar, coffee, etc.
• noun A trade-name for adulterated butter.
• noun A local English name of the coalfish, Pollachius virens.
• noun A common name in the United States for a species of oak, Quercus nigra, and also, in the Gulf States, for Q. Catesbæi, small trees of little value except for fuel.
• noun The larva of a sawfly, Athalia centifolia or A. spinarum, one of the Tenthredinidæ, destructive to turnips. Also called nigger.
• noun A kind of hand-weapon consisting of a short elastic shaft having at one end a heavy metal head cased in netting, leather, etc.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Min.) A name given by English miners to sphalerite, or zinc blende; -- called also false galena. See blende.
• noun Caramel or burnt sugar, used to color wines, spirits, ground coffee, etc.
• noun obsolete A large leather vessel for beer, etc.
• noun (Bot.) The Quercus nigra, or barren oak.
• noun The ensign of a pirate.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun obsolete, mineralogy, UK Sphalerite; zincblende.
• noun obsolete Caramel or burnt sugar, used to colour wines, spirits, ground coffee, etc.
• noun obsolete A large leather vessel for beer, etc.
• noun obsolete The Quercus nigra, or barren oak.