DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   MST
       n 1: standard time in the 7th time zone west of Greenwich,
            reckoned at the 105th meridian west; used in the mountain
            states of the United States [syn: Mountain Time,
            Mountain Standard Time, MST]