Definify.com
Webster 1913 Edition
Black-jack
Black′-jackˊ
,Noun.
1.
(Min.)
A name given by English miners to sphalerite, or zinc blende; – called also
false galena
. See Blende
. 2.
Caramel or burnt sugar, used to color wines, spirits, ground coffee, etc.
3.
A large leather vessel for beer, etc.
[Obs.]
4.
(Bot.)
The
Quercus nigra
, or barren oak. 5.
The ensign of a pirate.
Definition 2024
black-jack
black-jack
English
Noun
black-jack (countable and uncountable, plural black-jacks)
- (obsolete, mineralogy, Britain) Sphalerite; zincblende.
- (obsolete) Caramel or burnt sugar, used to colour wines, spirits, ground coffee, etc.
- (obsolete) A large leather vessel for beer, etc.
- (obsolete) The Quercus nigra, or barren oak.