Part of the Operating systems glossary: Mac OS is the computer operating system for Apple Computer's Macintosh line of personal computers and workstations. A popular feature of its latest version, Mac OS X, is a desktop interface with some 3-D appearance characteristics.
The Preakness Stakes is an American flat thoroughbred horse race held on the third Saturday in May each year at Pimlico Race Course in Baltimore, Maryland. It is a Grade I race run over a distance of 9.5 furlongs (13â16 miles (1,900 m)) on dirt.
In the United States, the three races that make up the Triple Crown are: 1  Kentucky Derby, run over the 11â4-mile (2.0 km) dirt track at Churchill Downs in Louisville, Kentucky. 2  Preakness Stakes, run over the 13â16-mile (1.9 km) dirt track at Pimlico Race Course in Baltimore, Maryland.