river in E Ireland: site of a battle (1690) in which the forces of William III of England defeated the Jacobites of James II, resulting in his flight to France: c. 70 mi (113 km)
See Boyne in American Heritage Dictionary 4
(boin)
A river of eastern Ireland flowing about 113 km (70 mi) to the Irish Sea. In the Battle of the Boyne on July 1, 1690, the armies of King William III defeated the forces of James II, who fled to France.