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Definition of onion dome noun from the Oxford Advanced Learner's Dictionary

onion dome

noun
 
/ˌʌnjən ˈdəʊm/
 
/ˌʌnjən ˈdəʊm/
(architecture)
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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
See onion dome in the Oxford Advanced American Dictionary
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