Dictionary
caisson
noun cais·son \ˈkā-ˌsän, -sən, British also kə-ˈsün\
Definition of CAISSON
1
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
2
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
3
: coffer 3
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Origin of CAISSON
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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