Dictionary

caisson

noun cais·son \ˈkā-ˌsän, -s^ən, British also kə-ˈsün\

Definition of CAISSON

a : a chest to hold ammunition

b : a usually 2-wheeled vehicle for artillery ammunition attachable to a horse-drawn limber; also : a limber with its attached caisson

a : a watertight chamber used in construction work under water or as a foundation

b : a hollow floating box or a boat used as a floodgate for a dock or basin

: coffer 3

See caisson defined for kids

French, from Middle French, from Old Occitan, from caissa chest, from Latin capsa — more at case

First Known Use: circa 1702

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