battleship

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any one of a class of warships of the largest size, carrying the greatest number of weapons and clad with the heaviest armor.

from The Century Dictionary.

• noun A ship of war; specifically, a powerful war-ship designed to fight in the line of battle; in recent use, a heavily armored and armed sea-going war-ship intended for the line of battle.

from the GNU version of the Collaborative International Dictionary of English.

• (Nav.) An armor-plated warship built of steel and heavily armed, generally having over ten thousand tons displacement, and intended to be fit to combat the heaviest enemy ships in line of battle; the most heavily armed and armored class of warship at any given time.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun military Large capital warship displacing tens of thousands of tons, heavily armoured and armed with big guns. Battleships are now obsolescent, replaced by smaller vessels with guided missiles. Types: dreadnought, pre-dreadnought.
• noun Non-functional rocket stage, used for configuration and integration tests.
• noun A guessing game played on grid paper, see Battleship (game)

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun large and heavily armoured warship