caisson

• a chest to hold ammunition
• an ornamental sunken panel in a ceiling or dome
• a two-wheeled military vehicle carrying artillery ammunition
• large watertight chamber used for construction under water
• A four-wheeled carriage for conveying ammunition, consisting of two parts, a body and a limber. In light field batteries there is one caisson to each piece, having two ammunition boxes on the body, and one on the limber
• A chest filled with explosive materials, to be laid in the way of an enemy and exploded on his approach
• A water-tight box, of timber or iron within which work is carried on in building foundations or structures below the water level
• A hollow floating box, usually of iron, which serves to close the entrances of docks and basins
• A structure, usually with an air chamber, placed beneath a vessel to lift or float it
• A sunk panel of ceilings or soffits

Report error with a word Suggest a new definition

You can also check definition for caisson on wikipedia or google (link opens in new window)