[ sim-plon; French san-plawn ]
/ ˈsɪm plɒn; French sɛ̃ˈplɔ̃ /


a mountain pass in S Switzerland, in the Lepontine Alps: crossed by a carriage road constructed 1800–06 on Napoleon's orders. 6592 feet (2010 meters) high.
a tunnel between Switzerland and Italy, NE of the Simplon Pass: longest tunnel in the world. 12¼ miles (20 km) long. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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