[{"Bold_text": "noun", "List Items": ["a structure used in underwater work, consisting of an airtight chamber, open at the bottom and containing air under sufficient pressure to exclude the water.", "a boatlike structure used as a gate for a dock or the like.", "Nautical.Also called camel , pontoon .a float for raising a sunken vessel, sunk beside the vessel, made fast to it, and then pumped out to make it buoyant.a watertight structure built against a damaged area of a hull to render the hull watertight; cofferdam.", "Also called camel , pontoon .a float for raising a sunken vessel, sunk beside the vessel, made fast to it, and then pumped out to make it buoyant.", "a watertight structure built against a damaged area of a hull to render the hull watertight; cofferdam.", "a two-wheeled wagon, used for carrying artillery ammunition.", "an ammunition chest.", "a wooden chest containing bombs or explosives, used formerly as a mine.", "Architecture. coffer(def4) coffer(def4)."]}]