battleship

Short definition from Wiktionary

Noun

1. 1
   A large capital warship displacing thousands to tens of thousands of tons, heavily armoured and armed with large-caliber guns; now obsolescent and replaced by smaller vessels with guided missiles.
2. 2
   A large capital warship displacing thousands to tens of thousands of tons, heavily armoured and armed with large-caliber guns; now obsolescent and replaced by smaller vessels with guided missiles: A starship of comparable role
3. 3
   A ship of the line.
4. 4
   A non-functional rocket stage, used for configuration and integration tests.
5. 5
   A guessing game played on grid paper; see Battleship (game).