undercellar

English

Etymology

under- +‎ cellar

Noun

undercellar (plural undercellars)

1. A lower cellar.
   • 1953, John Coates, Faithful in my fashion, page 319:

     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.