Webster's English Dictionary

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flask

flask \'flask\ n [MF flasque powder flask, deriv. of LL flascon-, flasco 
   bottl] often attrib e, prob. of Gmc origin; akin to OHG flaska bottle 1: a 
   container often somewhat narrowed toward the outlet and often fitted w ith 
   a closure; esp : a broad flattened necked vessel used esp. to carry 
   alcoholic beverages on the person 2: a frame that holds molding sand used 
   in a foundry