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caisson
noun
- a chest for holding ammunition
- a two-wheeled wagon for transporting ammunition
- a watertight enclosure inside which underwater construction work can be done
- a watertight box for raising sunken ships: after the box is sunk and attached, the water is forced out of it so that it floats
- a hollow, boat-shaped box, used as a floodgate at a dock or basin
See caisson in American Heritage Dictionary 4
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