Apse
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In architecture, an apse is a semicircular recess covered with a hemispherical vault or semi-dome, also known as an exedra. In Byzantine, Romanesque, and Gothic Christian church architecture, the term
Typical early Christian Byzantine apse with a hemispherical semi-dome in the Basilica of Sant'Apollinare, Classe, Italy
Triple apse of Basilica di Santa Giulia, northern Italy
East end of the abbey church of Saint-Ouen, showing the chevet, Rouen, Seine-Maritime, France
A chevet apse vault, Toulouse, France
Exedra
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An exedra is a semicircular architectural recess or platform, sometimes crowned by a semi-dome, and either set into a building's façade or free-standing. The original Greek word ἐξέδρα was applied to
Apse
…ἀψίς, apsis, 'arch'; sometimes written apsis; pl.: apsides) is a semicircular recess covered with a hemispherical vault or semi-dome, also known as an exedra. In Byzantine, Romanesque, and Gothic Christian church (including cathedral and abbey) architecture, the term is applied to a semi-circular or polygonal…
Exedra of Pamphilidas, Acropolis of Lindos, Rhodes, Greece
The foundations and partial floor of a late Roman villa. The floored part is the exedra. The rest of the floor has deteriorated and is missing, with only parts of the hypocaust columns remaining. Hot air circulated through the hypocaust to heat the house.
Exedra-shaped niche with a Apollo sculpture, at the Palazzo Giusti, Verona
Exedra of the Cortile della Pigna, at the Vatican Palace in Rome