battleship

noun
  1. 1

    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.

  2. 2

    Non-functional rocket stage, used for configuration and integration tests.

  3. 3

    A guessing game played on grid paper, see Battleship (game)

Source: https://en.wiktionary.org/wiki/battleship