DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   gamma
       n 1: the 3rd letter of the Greek alphabet
       2: a unit of magnetic field strength equal to one-hundred-
          thousandth of an oersted
       3: Portuguese navigator who led an expedition around the Cape of
          Good Hope in 1497; he sighted and named Natal on Christmas
          Day before crossing the Indian Ocean (1469-1524) [syn: da
    Gamma, Vasco da Gamma, Gamma]