undercellar

Etymology

From under- + cellar.

undercellar means A lower cellar. Lexicurio rates it Sui generis — a strength score of 87 out of 100.

noun

A lower cellar.“The middle courtyard and its buildings are a fortress. The walls consist of six feet of reinforced concrete. There are cellars and undercellars, or whatever you might call them; and there are wells, storerooms, and powerhouses within the fortress.”