This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A long and open portico within the gymnasium.

n. Same as xyst.

n. [capitalized] [NL.] A generic name variously applied to certain hymenopterous, coleopterous, and lepidopterous insects.

"Next to this "xystus" and to the double colonnade should be laid out the uncovered walks which the Greeks term [Greek: paradromides] and our people "xysta," into which, in fair weather during the winter, the athletes come out from the "xystus" for exercise."