if you use Google Advanced Search -
http://www.google.co.uk/advanced_search?hl=en
and enter the two words 'traditional gynasium' ......
several sites come up using the word that you want ......
as this goes back to the Persians - there are more than one spelling of the Persian word ((Persian: زورخانه) for this traditional gynasium into English ......
eg Zurkhaneh or Zourkhaneh
this Wikepedia site tells you more -
http://en.wikipedia.org/wiki/Zourkhaneh
look a little down the page!
{accuracy of Wike is suspect!}
this Iranian Artist's site spells the word as -
ZOORKHANEH
maybe more accurate?
the Iranian site also shows pictures of such a typical gym!
{I couldnt find the word in Chambers!}