Definitions from Wiktionary (caisson)

▸ noun:  (engineering) An enclosure from which water can be expelled, in order to give access to underwater areas for engineering works etc.
▸ noun:  The gate across the entrance to a dry dock.
▸ noun:  (nautical) A floating tank that can be submerged, attached to an underwater object and then pumped out to lift the object by buoyancy; a camel.
▸ noun:  (military) A two-wheeled, horse-drawn military vehicle used to carry ammunition (and a coffin at funerals).
▸ noun:  (military) A large box to hold ammunition.
▸ noun:  (military) A chest filled with explosive materials, used like a mine.
▸ noun:  (architecture) A coffer.

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