[a. OF. fust (mod.F. fût) cask, primarily log, tree-trunk:—L. fustem cudgel.]

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  † 1.  A cask for wine; in phrase to savour of the foist: to be ‘fusty.’ Obs.

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a. 1533.  Ld. Berners, Gold. Bk. M. Aurel. (1546), Q b. Good wyne sometyme sauoureth of the foyst.

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  2.  Hence, Fustiness. [F. fust (Cotgr.).]

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1819.  Rees, Cycl., Foist, used to signify a musty sort of smell among hay, straw, grain, and other farm products.

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1876.  Whitby Gloss., Foist, the mildew’d scent of a cellar.

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