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Each rectangular section of a vaulted church, consisting of one groin vault, is referred to as a bay.
- A protrusion or recess on a building, particularly the east end of a church, that is domed or vaulted and typically houses the altar.
- The intersection of two barrel vaults at right angles results in a groin or groined vault, often referred to as a double barrel vault or cross vault. The edge where the intersecting vaults are located is referred to as the "groin." Groin vaults can have pointed rather than rounded arches.
- A groin vault offers better material and labor savings than a barrel vault. The barrel vault only has to be abutted at its four corners because the thrust is concentrated along the groins or arrises (the four diagonal edges formed around the locations where the barrel vaults join).
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