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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.