English

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Noun

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black jack (countable and uncountable, plural black jacks)

  1. Alternative spelling of blackjack
  2. A gamefish of species Caranx lugubris.
  3. A beggartick (Bidens spp., family of Asteraceae)
  4. (obsolete) The larva of a turnip sawfly (Athalia rosae)
    Synonyms: black canker, black palmer, nigger
    • 1807, Richard Parkinson, The Experienced Farmer, Enlarged and Improved, page 370:
      There is a sort of black caterpillar called a black jack, which is seldom seen; but when they do come, they make terrible havock.
  5. (mining, mineralogy) Sphalerite.

References

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Polish

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Polish Wikipedia has an article on:
Wikipedia pl

Etymology

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Unadapted borrowing from English blackjack.

Pronunciation

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Noun

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black jack m animal

  1. (card games) Alternative spelling of blackjack

Declension

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Further reading

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  • black jack in Wielki słownik języka polskiego, Instytut Języka Polskiego PAN
  • black jack in Polish dictionaries at PWN