Definition of "Forth"

Forth¹

proper noun
1. A river in Scotland that flows for about 47 km (29 miles) from The Trossachs through Stirling to the Firth of Forth on the North Sea.
2. A sea area that covers the Firth of Forth
3. A village in South Lanarkshire council area, Scotland (OS grid ref NS9453).

Forth²

proper noun
1. An imperative, stack-based high-level concatenative programming language, used mostly in control applications.