Definition that contains firth of clyde
- clyde a river in western Scotland that flows from the southern uplands into the Firth of Clyde; navigable by oceangoing vessels as far as Glasgow
- antonine wall a fortification 37 miles long across the narrowest part of southern Scotland (between the Firth of Forth and the Firth of Clyde); built in 140 to mark the frontier of the Roman province of Britain