A casemate is a fortified gun emplacement or armored structure from which guns are fired. Originally, the term referred to a vaulted chamber in a fortress. In armoured fighting vehicles that do not have a turret for the main gun, the structure that accommodates the gun is termed the casemate.
Origin of the term
The word comes from the Italian casamatta, the etymology of which is uncertain, though it could derive from casa (in the sense of "hut"), and matta (Latin matta), "done with reeds and wickers", thus a low-roof hut without windows or other openings set in marshy place. It could also derive from casa matta with matta in the sense of "false".
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