black jack

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black jack (countable and uncountable, plural black jacks)

  1. Alternative spelling of blackjack
  2. Caranx lugubris, a gamefish
  3. Bidens spp., from the family of Asteraceae
  4. (obsolete) The larva of a turnip sawfly (Athalia rosae)
    • 1807, Richard Parkinson, The Experienced Farmer, Enlarged and Improved, pg. 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.
    Synonyms: black canker, black palmer, nigger
  5. (mining, mineralogy) Sphalerite.