1. (n.) A chest to hold ammunition.

2. (n.) 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.

3. (n.) A chest filled with explosive materials, to be laid in the way of an enemy and exploded on his approach.

4. (n.) A water-tight box, of timber or iron within which work is carried on in building foundations or structures below the water level.

5. (n.) A hollow floating box, usually of iron, which serves to close the entrances of docks and basins.

6. (n.) A structure, usually with an air chamber, placed beneath a vessel to lift or float it.

7. (n.) A sunk panel of ceilings or soffits.

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