The bathroom of a Jack and Jill suite.

plural of battery pack

(electronics) A set of batteries or battery cells connected together to deliver a certain voltage, capacity, or power density, often with an integrated battery management system.

(military) A military battalion formally designated to engage in the construction of structures for military use.

(cooking) A type of bread made with a substantial liquid-to-flour ratio, so that the dough produces a batter.

plural of batter bread

Which has been tested on the battleground. / (figuratively) Which has been successfully put to the test in a real-life situation, in conditions of real use.

(military) A military unit of the armed forces which incorporates multiple branches of the military within a single command structure (also known as combined arms).

plural of line of battle ship

(historical) A kind of therapeutic bath, a forerunner to the jacuzzi.