n. Living quarters for junior officers and midshipmen on a warship (hence gunroom officers). In the past it was usually set in the forecastle.
the GNU version of the Collaborative International Dictionary of English
n. An apartment on the after end of the lower gun deck of a ship of war, usually occupied as a messroom by the commissioned officers, except the captain; -- called wardroom in the United States navy.
The Century Dictionary and Cyclopedia
n. Nautical, an apartment on the after part of the lower gun-deck of a man-of-war, devoted to the use of the junior officers.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. military quarters of midshipmen and junior officers on a British warship
Word Usage
"When Sheriff Wright came, he found the gunroom unlocked."