U.S. [f. JOINT sb. 14 + -IST.] The keeper of a ‘joint’ or illicit drinking-saloon.

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1881.  Juction City Republican, 25 August, 2/2. A. B. Grooms the St. Marys jointist who moved his place of business to an island in the Kaw river, to escape prosecution, was drowned in the river near the island.

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1889.  in Voice (N.Y.), 5 Sept. The Grand Jury had found nineteen indictments against jointists.

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1893.  Helen M. Gougar, in Arena (U.S.), March, 467. In Kansas … the liquor seller is the sneaking boot-legger, skulking jointist, criminal and outlaw, afraid of every shadow that falls across his hiding-place.

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