Tetraconch

A tetraconch, from the Greek for `four shells`, is a building, usually a church or other religious building, with four apses, one in each direction, usually of equal size. The basic ground plan of the building is therefore a Greek cross. They are most common in Byzantine, and related schools such as Armenian and Georgian architecture. It has bee.....
Found on http://en.wikipedia.org/wiki/Tetraconch

Tetraconch

A type of plan in which four interior apses that are joined together to form a clover shape, with each apse having a semi-domed vault. The clover shape is often used to support a dome. Compare with: cinquefoil, hexafoil, octafoil, quatrefoil, trefoil, triconch.
Found on http://www.virtualani.org/glossary/index.htm
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