onion dome

noun
🔊/ˌʌnjən ˈdəʊm/
🔊/ˌʌnjən ˈdəʊm/
(architecture建筑)
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  1. a dome found especially in Russia on top of churches, which is round at the sides and pointed at the top洋葱头穹顶(尤见于俄罗斯的塔楼等建筑)