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Casemate
Casemate Case"mate, n. [F. casemate, fr. It. casamatta, prob.
from casa house + matto, f. matta, mad, weak, feeble, dim.
from the same source as E. -mate in checkmate.]
1. (Fort.) A bombproof chamber, usually of masonry, in which
cannon may be placed, to be fired through embrasures; or
one capable of being used as a magazine, or for quartering
troops.
2. (Arch.) A hollow molding, chiefly in cornices.
Meaning of Casemates from wikipedia