Source : Webster's Revised Unabridged Dictionary (1913)

Treasury stock \Treas"ur*y stock\ (Finance)
   Issued stock of an incorporated company held by the company
   itself.

Source : WordNet®

treasury stock
     n : stock that has been bought back by the issuing corporation
         and is available for retirement or resale; it is issued
         but not outstanding; it cannot vote and pays no dividends
         [syn: {treasury shares}, {reacquired stock}]