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bluejack

[bloo-jak]
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noun
  1. a small oak, Quercus incana, of the southern U.S., having crooked branches and blue-green leaves.
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Origin of bluejack

1855–60, Americanism; blue + jack1, modeled after blackjack; so called from the bluish look of the leaves
Also called bluejack oak.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018