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Noun blackjack has 3 senses
- blackjack oak, blackjack, jack oak, Quercus marilandica - a common scrubby deciduous tree of central and southeastern United States having dark bark and broad 3-lobed (club-shaped) leaves; tends to form dense thickets
--1 is a kind of scrub oak
- blackjack, cosh, sap - a piece of metal covered by leather with a flexible handle; used for hitting people
--2 is a kind of bludgeon
- blackjack, twenty-one, vingt-et-un - a gambling game using cards; the object is to hold cards having a higher count than those dealt to the bank up to but not exceeding 21
--3 is a kind of card game, cards
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