
1) Ancient Greek promenade 2) Portico of ancient Rome 3) Roman portico
Found on
https://www.crosswordclues.com/clue/xyst

• (n.) Alt. of Xystus
Found on
http://thinkexist.com/dictionary/meaning/xyst/
Xyst Xys'tus noun [ Latin xystus , Greek ..., from ... to scrape, polish; -- so called from its smooth and polished floor.] (Anc. Arch.) A long and open portico, for athletic exercises, as wrestling, running, etc., for use in winter or in stormy weather.
Found on http://www.encyclo.co.uk/webster/X/3
xyst 1. A long and open portico, for athletic exercises; such as, wrestling, running, etc., for use in winter or in stormy weather. 2. In ancient Greek and Roman architecture, a covered portico; such as, a promenade. 3. In an ancient Roman villa, a garden walk planted with trees.
Found on http://www.wordinfo.info/words/index/info/view_unit/3836/
(in ancient Greek and Roman architecture) a covered portico, as a promenade. · (in an ancient Roman villa) a garden walk planted with trees.
Found on https://www.infoplease.com/dictionary/xyst
No exact match found.