GNU Collaborative International Dictionary of English

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1.       
   Cupola , n.; pl. Cupolas . [It. cupola, LL. cupula, cuppula (cf. L. cupula little tub). fr. cupa, cuppa, cup; cf. L. cupa tub. So called on account of its resemblance to a cup turned over. See Cup, and cf. Cupule.]
   (Arch.) A roof having a rounded form, hemispherical or nearly so; also, a ceiling having the same form. When on a large scale it is usually called dome.
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   A small structure standing on the top of a dome; a lantern.
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   A furnace for melting iron or other metals in large quantity, -- used chiefly in foundries and steel works.
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   A revolving shot-proof turret for heavy ordnance.
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   (Anat.) The top of the spire of the cochlea of the ear.
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