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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
railway
noun
 
 
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