1. 
   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== ...
   Found op http://en.wikipedia.org/wiki/Xystum
   
   
2. 
   xystum
   xystum An architectural term. It can refer to a wall, a promenade, an alley, or an open path. It may also refer to an atrium (open space in a building), ambulacrum (walk planted with trees), or parvis (enclosed area) in front of a basilica (Roman public building).
   Found op http://www.wordinfo.info/words/index/info/view_unit/3836/
   
   

Tip: double click on a word to show its meaning.