cupola

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cu·po·la / ˈkyoōpələ/ • n. a small dome, esp. a small dome on a drum on top of a larger dome, adorning a roof or ceiling. ∎  a gun turret; a small domed hatch above a gun turret on some tanks. ∎  (also cupola furnace) a cylindrical furnace for refining metals.DERIVATIVES: cu·po·laed adj.

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