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bluejack

[bloo-jak] /ˈbluˌdʒæk/
noun
1.
a small oak, Quercus incana, of the southern U.S., having crooked branches and blue-green leaves.
Also called bluejack oak.
Origin
1855-1860
1855-60, Americanism; blue + jack1, modeled after blackjack; so called from the bluish look of the leaves
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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