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1. A fortified enclosure for artillery on a warship.
2. An armored compartment for artillery on a rampart.
[French, from Italian casamatta : perhaps casa, house (from Latin casa) + matto, mad, crazy (from Latin mattus, drunk, past participle of madēre, to be drunk).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Military) an armoured compartment in a ship or fortification in which guns are mounted
[C16: from French, from Italian casamatta, perhaps from Greek khasmata apertures, plural of khasma chasm]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a chamber for a gun in a fortification or warship.
[1565–75; < Middle French < Italian casamatta]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.