DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   CST
       n 1: standard time in the 6th time zone west of Greenwich,
            reckoned at the 90th meridian; used in the central United
            States [syn: Central Time, Central Standard Time,
            CST]