souterrain


sou·ter·rain

S5636550 (so͞o′tə-rān′)n. An underground passageway, chamber, or series of chambers, sometimes having a roof of stone slabs, built as part of an ancient settlement or fort, especially in the British Isles.
[Earlier, any underground passage or storeroom, from French, from Old French, sozterrain (formed on the model of Latin subterrāneus, underground) : soz, under (from Latin subtus, from sub; see upo in Indo-European roots) + terre, earth (from Latin terra; see ters- in Indo-European roots).]

souterrain

(ˈsuːtəˌreɪn) n (Archaeology) archaeol an underground chamber or passage[C18: from French]

souterrain

Any underground passage or chamber.