a river in the E Republic of Ireland, rising in the Bog of Allen and flowing northeast to the Irish Sea: William III of England defeated the deposed James II in a battle (Battle of the Boyne) on its banks in 1690, completing the overthrow of the Stuart cause in Ireland. Length: about 112 km (70 miles)
Boyne in American English
(bɔɪn)
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)