nXyst(Anc. Arch) A long and open portico, for athletic exercises, as wrestling, running, etc., for use in winter or in stormy weather.
Century Dictionary and Cyclopedia
nxystIn ancient architecture, a covered portico or open court, of great length in proportion to its width, in which athletes performed their exercises; or, in Roman villas, sometimes, a garden walk planted with trees. Also xystos, xystus.
Chambers's Twentieth Century Dictionary
nXystzist a covered portico used by athletes for their exercises
XystAlso Xyst′os, Xyst′us
Webster's Revised Unabridged Dictionary
L. xystus, Gr., from to scrape, polish; -- so called from its smooth and polished floor.]