creek in W Md.: its juncture with the Potomac is the site of a bloody, but indecisive, Civil War battle (1862)
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See Antietam in American Heritage Dictionary 4
A creek of north-central Maryland emptying into the Potomac River. The bloody and inconclusive Civil War Battle of Antietam (or Sharpsburg, as it is often called in the South) was fought along its banks on September 17, 1862.