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cais·son  audio  (ksn, -sn) KEY 

  1. A watertight structure within which construction work is carried on under water.
  2. See camel.
  3. A large box open at the top and one side, designed to fit against the side of a ship and used to repair damaged hulls under water.
  4. A floating structure used to close off the entrance to a dock or canal lock.
    1. A horse-drawn vehicle, usually two-wheeled, used to carry artillery ammunition and coffins at military funerals.
    2. A large box used to hold ammunition.

French, from Old French, large box, alteration (influenced by caisse, chest), of casson from Italian cassone, augmentative of cassa, box, from Latin capsa

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