souterrain
underground, subterranean
adjective noun soo-teh-REHN Rare
Origin: Latin subterraneus
Also means
tunnel, underground passage
Usage Note
Souterrain describes anything below ground level, from un parking souterrain (underground car park) to hidden passages. As a noun, un souterrain refers to a tunnel or underground chamber, often found in medieval fortifications. The feminine adjective form is souterraine.
Examples
"Il y a un passage souterrain sous la ville."
Natural Translation
There is an underground passage beneath the city.
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