Webster's English Dictionary

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cupola

cu.po.la \'kyu:-p*-l*, -.lo-\ n [It, fr. L cupula, dim. of cupa tub] 1a: a 
   rounded vault resting on a circular or other base and forming a roof  or a 
   ceiling 1b: a small structure built on top of a roof  2: a vertical 
   cylindrical furnace for melting iron in the foundry having tu yeres and 
   tapping spouts near the bottom