Word.ws English Dictionary

black-jack

black-jack noun: sphalerite; zincblende. Also the alternative form of blackjack.

Noun

black-jack (countable and uncountable, plural black-jacks)

  1. (UK, obsolete, uncountable) Sphalerite; zincblende.
  2. (obsolete, uncountable) Caramel or burnt sugar, used to colour wines, spirits, ground coffee, etc.
  3. (obsolete) A large leather vessel for beer, etc.
    • ‘Oh yes, we’ll probably be wolfing down pasty jambics and swigging away at great black jacks of swingeing ale in no time now,’ he went on heartly.1936, Norman Lindsay, The Flyaway Highway, Sydney: Angus and Robertson, page 35
  4. (obsolete) A water oak or barren oak (Quercus nigra).
  5. (obsolete, circa 1700s) A native African longshoreman or sailor working on a boat.
  6. A coalfish (Pollachius virens).
  7. A larva of a sawfly of species Athalia rosae (syns. Athalia centifolia, A. spinarum).

Also used as

black-jack is also the alternative form of blackjack.

Forms of black-jack

pluralblack-jacks

Questions about black-jack

What does black-jack mean?
Black-jack means sphalerite; zincblende.
What part of speech is black-jack?
Black-jack is a noun.
What is the plural of black-jack?
The plural of black-jack is black-jacks.

Words near black-jack in the dictionary

  1. black-hooded antshrike
  2. black-hooded antshrikes
  3. black-house
  4. black-houses
  5. black-humored
  6. black-jack
  7. black-jacks
  8. black-legged kittiwake
  9. black-legged kittiwakes
  10. black-legged tick
  11. black-legged ticks

Source and license

Adapted from Wiktionary: black-jack (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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