onion dome
Noun
Meaning
a dome that is shaped like a bulb; characteristic of Russian and Byzantine church architecture
Source: WordNetSynonyms
cupola
rotunda
domed roof
titular dome
bell-shaped roof
canopy roof
dome-shaped ceiling
domical ceiling
hemispherical roof
spherical ceiling
vaulted ceiling
vaulted dome
curved roof
arched ceiling
arched dome
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Hypernyms
Examples
One my favorite things is to go to the provinces of Russia and see the 18th century wood churches with the onion dome architecture. These humble wonders of incredible imagination of architects that were obviously not living in places like Paris or London, but they've created these amazing churches.