The Collaborative International Dictionary of English v.0.48:

Toman \To*man"\, n. [Per. t[=o]m[=a]n; from a Mongol word
   signifying, ten thousand.]
   A money of account in Persia, whose value varies greatly at
   different times and places. Its average value may be reckoned
   at about two and a half dollars.
   [1913 Webster]