caisson

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noun cais·son \ˈkā-ˌsän, -sən, British also kə-ˈsün\

Definition of caisson

  1. 1a :  a chest to hold ammunitionb :  a usually 2-wheeled vehicle for artillery ammunition attachable to a horse-drawn limber; also :  a limber with its attached caisson

  2. 2a :  a watertight chamber used in construction work under water or as a foundationb :  a hollow floating box or a boat used as a floodgate for a dock or basin

  3. 3 :  coffer 3

Origin and Etymology of caisson

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


First Known Use: circa 1702



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a rounded knoll or a ridge of ice

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