undercellar

noun

undercellar

noun

Etymology From under- + cellar.

1

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.1953, John Coates, Faithful in my fashion, page 319:

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