cu ‧ po ‧ la /ˈkjuːpələ/ BrE AmE noun [countable]
[ Date: 1500-1600 ; Language: Italian ; Origin: Latin , from cupa ; ⇨ ↑ cup 1 ]
a round structure on the top of a building, that is shaped like an upside down bowl:
a golden edifice with an onion-shaped cupola