DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   arbitrageur
       n 1: someone who engages in arbitrage (who purchases securities
            in one market for immediate resale in another in the hope
            of profiting from the price differential) [syn:
            arbitrageur, arbitrager, arb]