onion dome
US /ˈʌn.jən ˌdoʊm/
UK /ˈʌn.jən ˌdoʊm/

1.
cupola a cipolla
a dome whose shape resembles an onion, typically found on Russian Orthodox churches and other Eastern European buildings
:
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The church was topped with five golden onion domes.
La chiesa era sormontata da cinque cupole a cipolla dorate.
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The distinctive shape of the onion dome is a hallmark of Russian architecture.
La forma distintiva della cupola a cipolla è un segno distintivo dell'architettura russa.