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| A spherical triangle that transforms a square bay into a circle for the springing of a dome. |
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| The church that serves as seat of a bishop. (The bishop’s chair is called a cathedra.) |
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| A building associated with a Christian martyr. |
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| A screen in Byzantine churches that divides the nave from the chancel and that is used as a support for devotional images or icons. |
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| A building, generally octagonal, used for the Christian rite of baptism. |
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| An elaborate tomb, named after the tomb of King Mausoleus. |
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| "King's hall". A hall used for public administration. The term generally refers to a rectangular building that has a central section with a higher roof (the nave if a church) flanked by lower aisles on both long sides. early Christians adapted the form as a basis for church design, replacing one apse with the main entrance and establishing a processional axis the length of the building. The altar was placed in the apse at the end. |
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| Church plan in the form of a Greek cross, with a square central mass and four arms of equal length. |
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| Church plan with one arm longer than the other three. |
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| The western arm of a basilican church and is the central approach to the high altar. The nave is the central section of a church and has a higher roof. |
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| Windows placed high in a wall, generally above lower roof elements. The purpose of the clerestory is to give light to the inner space of a large building. |
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| In early Christian churches, the atrium was a large open courtyard, surrounded by covered galleries, which preceded the entrance to the church. |
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