onion dome

noun Architecture.
a bulbous, domelike roof ending in a sharp point, characteristically used in Russian Orthodox church architecture to cover cupolas or towers.

Origin:
1955–60

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
onion dome
 
n
a bulb-shaped dome characteristic of Byzantine and Russian church architecture

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
The onion dome churches of the coal and steel industry communities are a testament to the ethnic origins of the residents.
The bandstand has a high onion dome roof, supported by slender, bracketed cast iron posts.
On top of the decorative onion dome is a three-bar cross.
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