CASEMATE

casemate. Casemate, n. an arch in the flank of a bastion

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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. 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. 2. (Arch.) A hollow molding, chiefly in cornices.