(mnemonic) A mnemonic phrase to help remember the order of the seven colours of the rainbow: red, orange, yellow, green, blue, indigo, violet.

(music, mnemonic) A mnemonic for the order of sharps: F C G D A E B.

(military, nautical) A large capital warship displacing tens of thousands of tons, heavily armoured and armed with big guns; now obsolescent and replaced by smaller vessels with guided missiles.

A medium grey colour tinged with blue, like that of a battleship.

Of a medium grey colour tinged with blue, like that of a battleship.

plural of battleship

(military) The conditions of battle, including terrain, weather, infrastructure, etc., considered in a unified military strategy to integrate and combine armed forces for the military theatre of operations.

plural of battlespace

plural of battleship-shaped curve

(archaeology) A two-dimensional region with parallel sides and pointed ends, usually representing the emergence and later disappearance of an entity in a graph over time.