n. A water-tight wooden inclosure built in a body of water, in order to obtain a firm and dry foundation for bridges, piers, etc., by pumping out the water from its interior.n. In a war-ship, one of a series of compartments. in the vicinity of the water-line above the protective deck, built in the interior against the ship's side or around hatches, forming a double wall, which can be packed to prevent water from entering the vessel after the side has been pierced by shot. In the United States navy the packing is made of the pith of corn-stalks. See def. 2.