quincunx plan

cross-in-square plan

Said of the plan of an early Christian church that was divided into nine bays; the central bay was a large square with a dome over its center; the four corner bays were each small, domed, and square in plan; the remaining four bays were barrel vaults.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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