[ 'keɪsmeɪt ]
■ noun historical
1》 a small room in the thickness of the wall of a fortress, with embrasures from which guns or missiles can be fired.
2》 an armoured enclosure for guns on a warship.
Origin
C16: from Fr., from Ital. casamatta , perh. from Gk khasma , khasmat- (see chasm ).