Webster's English Dictionary

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caisson

cais.son \'ka--.sa:n, 'ka-s-*n\ n [F, aug. of caisse box, fr. OProv caisa, 
   fr. L capsa chest, c]ase - more at CASE 1a: a chest to hold ammunition  1b: 
   a 2-wheeled vehicle for artillery ammunition attachable to a horse-draw n 
   limber 2a: a watertight chamber used in construction work under water or as 
   a foun dation 2b: a float for raising a sunken vessel  2c: a hollow 
   floating box or a boat used as a floodgate for a dock or basin  3: COFFER