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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).]

case′mat′ed adj.
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.
References in periodicals archive ?
Inside the fort are a casemated barracks for 96 men, together with a master gunner's house, officers' mess and associated ablutions, kitchens and magazines.
In that year, Colonel Jonathan Williams began the construction on Governor's Island of the first casemated battery in this country as one of the defenses of New York.