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. ] [ 1913 Webster ]

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. [ 1913 Webster ]

2. (Arch.) A hollow molding, chiefly in cornices. [ 1913 Webster ]

a. Furnished with, protected by, or built like, a casemate. Campbell. [ 1913 Webster ]