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What is a black jack?

What is a black jack? Here are some definitions.

Noun
  1. Alternative spelling of blackjack
  2. Caranx lugubris, a gamefish
  3. Bidens spp., from the family of Asteraceae
  4. A blackjack oak, Quercus marilandica, a small tree
  5. Sphalerite, a mineral sometimes called black-jack by miners
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