Broadside

1. One side of a vessel above the waterline.
2. All the guns on one side of a warship or mounted (in rotating turrets or barbettes) so as to be able to fire on the same side of a warship.
3. The simultaneous firing of all the guns on one side of a warship or able to fire on the same side of a warship.
4. Weight of broadside: the combined weight of all projectiles a ship can fire in a broadside engagement, or the combined weight of all the shells which a group of ships that have formed a line of battle can collectively fire on the same side.