An apse is a wing or recess in a church building that sticks out from the main building. It always has a semicircular end, and is usually situated at the end of the church behind the altar.
An apse is a domed or vaulted section of a church, often at the east end of the building, that usually contains the altar.
Yes, a Apse.
Apse
Apse
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Apse
Apse
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A usually semicircular or polygonal, often vaulted recess, especially the termination of the sanctuary end of a church.
Its called an apse.
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An absidiole is a small or secondary apse in a church.