An architectural half-dome or semi-dome; a vaulted roof covering that forms a hemisphere or partial dome.
From demi- (half) + dome (a rounded vault forming a roof). An architectural term describing a specific type of vault that covers a semicircular space.
The Pantheon in Rome is famous for its massive dome, but many Byzantine churches used demidomes as half-domes in front sections—it's a clever architectural trick to create the illusion of a floating space without needing an enormous dome.
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