Xystum
A Xystum is an architectural term. It can refer to a wall, promenade, alley or open path. It can also refer to an atrium, ambulacrum or parvis in front of a basilica.
Source
Curl, James Stevens. A Dictionary of Architecture and Landscape Architecture (Second ed.). Oxford University Press. p. 880. ISBN 0-19-860678-8. {{cite book}}
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